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Project acronym: Project Title:
Smart Membrane for hydrogen energy conversion: All fuel cell functionalities in One material
Funding Scheme: Collaborative project – Small-scale focused research project Grant Agreement: NMP3-SL-2009-227177 st st Period covered: From 1 April 2009 to 31 March 2012 Scientific representative of the project's coordinator: Dr. Jessica THERY Commissariat à l'Energie Atomique et aux Energies Alternatives Tel: +33 438 78 19 40/+33 6 22 86 15 20 Fax: +33 438 78 51 57 E-mail: email@example.com Project website: www.smallinone.eu
WP0 – Management
Due Date of Deliverable: Actual Submission Date: 31/03/2012+60days 23/05/2012 Deliverable Identification Deliverable Number: Deliverable Title: Responsible Beneficiary: Contributing Beneficiaries:
D0.3.3 36 Month Final report (public, dissemination) CEA/ALMA All partners Dissemination level
Public Restricted to other programme participants (including the Commission Services) Restricted to a group specified by the consortium (including the Commission Services) Confidential, only for members of the consortium (including the Commission Services)
Proprietary rights statement This document contains information, which is proprietary to the SMAllinOne consortium. Neither this document, nor the information contained herein, shall be used, duplicated or communicated by any means to any third party, in whole or in parts, except prior written consent of the SMAllinOne consortium.
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1. Content
1. Content.......................................................................................................................... 2 2. Final publishable summary report ................................................................................. 3 2.1 Executive summary ............................................................................................. 3 2.2 Project context and objectives ............................................................................. 4 2.3 Main S&T results/foregrounds ............................................................................. 8 2.4 Potential impact and dissemination and exploitation of results .......................... 19 2.5 Consortium and contact information .................................................................. 21 3. Use and dissemination of foreground .......................................................................... 22 3.1 Section A: Dissemination (Public)...................................................................... 22
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2. Final publishable summary report
Smart Membrane for hydrogen energy conversion: All fuel cell functionalities in One material
2.1 Executive summary
A breakthrough of Proton Exchange Membrane Fuel Cells (PEMFC) requires a radical performances improvement of the key fuel cell material components (catalysts and protonic membrane) as well as highly innovative solutions to overcome the membrane assembly and integration limitations. The SMALLINONE project addresses an architecture that strongly differs from the classical approach. The catalysts and the membrane are deposited step by step on a porous substrate using vacuum techniques. This architecture can be compared to the "top down integration" approach that is common in microelectronic. With respect to classical PEM fuel cell, this modifies drastically the morphology of the fuel cell materials. This innovative architecture is associated with the development of the basic PEM fuel cell materials (catalyst and ionic membrane) using vacuum technologies. Volatile precursors suitable for the deposition of proton conductive membranes with vacuum techniques were synthesized. Proton conductive membranes were successfully deposited via PECVD, iCVD and ASPD. Conductivities as high as 150-200mS/cm were reached. For the realization of a composite catalyst via vacuum techniques two approaches were developed, direct synthesis of the composite material in vacuum and injection of catalyst nano-particles. In this frame, composite materials were successfully developed via photodeposition of platinum cluster on various conductive supports such as ATO nanoparticles. For these last composite catalysts systems, a quite innovative UV photoreductive deposition method using covalently attached UV-asensitizing benzophenone (BPh) moieties onto the surface of inorganic conductive (WO3, WC, & ATO NPs) was developed. This method was compared to an hydride-mediated chemical reductive process. Promising electrochemical outputs were measured (ATO support disclosed most promising results). The use of the UV-reactive benzophenone modification shell in the photochemical synthesis was shown to afford lower-sized deposited Pt nanoparticles. These vacuum deposited catalysts have been associated with the plasma processes for the synthesis of an ion conductive catalyst composite. These materials have been assembled to build fuel cells. For a complete evaluation of the material potential, two fuel cell configurations were used: planar breathing fuel cells, without hot pressing the materials between bipolar plates: the various layers are deposited onto a porous substrate and tested in a self-breathing configuration. We also have deposited materials on commercial gas diffusion layers hot pressed between bipolar plates. In the planar breathing configuration, open circuit voltage of 900mV could be measured provided membranes thicknesses superior to 6µm are used. Coupling the vacuum catalysts with a Nafion® membrane power density of 120mW/cm2 could be measured (platinum load 100µg/cm2). When the MEA is sandwiched between bipolar plates, the result is quite close with a commercial Nafion® membrane as separator but when a vacuum deposited membrane is used as separator, no open circuit voltage could be measured. On the whole, one can see that the soft conditions of the planar breathing configuration are favorable to reach correct open circuit voltages: the thin vacuum membranes might be damaged by pressurization. Additionally, the deposition on rough gas diffusion layer is favorable to the formation a crossing defects. On the whole, the mechanical stability of these vacuum deposited membrane are below the one of Nafion® like membrane.
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2.2 Project context and objectives
Today, there are many types of fuel cells in the industry. The structure of a fuel cell system can take the form of either a stack or a planar system. A fuel cell "stack" is formed when groups of cells are layered and combined in series via bipolar plates. Fuel cell stack generally require bipolar plates and thick end plates, as well as additional components such as pumps and fans. Planar fuel cell has a simpler design and is formed when the cells are placed on a flat surface, next to each other, in succession, with opposing electrodes connected. A planar passive fuel cell does not require anything else other than a fuel supply; the air needed for the reactions flow in automatically from the surroundings1. Fuel cell stack is the most common architecture. It is used for automotive and stationary applications but it can also be used for portable systems in the range 50W-500W. Planar breathing fuel cells are mainly used for micro-fuel cells (5-50W), for which the power density is not the limitation, but rather the ratio power/weight. Depending on the application, the targets for success in the marketplace differ. For example, the targets for automotive fuel cells include a cost target of $30/kW by 2015, 5,000-hour durability and increased efficiency to 60%. The cost target is for production at manufacturing volumes of 500,000 systems per year2 3. In other potential applications for fuel cells, such as stationary power generation (distributed power), backup power, portable power, material handling, and other specialty applications, the life-cycle cost of the competing technology allows for a higher fuel cell cost. These applications are considered early markets for fuel cells. For example, for stationary power generation key targets include a fuel cell cost of $750/kW and a durability of 40,000 hours. For Micro fuel cells, the challenges are mainly focused on the miniaturization of the systems and judicious coupling with the hydrogen sources4. Of course, costs must also be competitive and costs of $10/W are targeted. Last year, the educational fuel cell sector has seen shipments of over 100,000 units over the past year – making 2009-2010 the year that mass commercialisation of the portable sector began. After a number of false starts and false promises, 2010 was the year that mass commercialisation began in a number of other portable fuel cell niches. The forecasts show that 40 million of portable fuel cells could be shipped annually by 2020, with small portable fuel cells (1-100 W) seeing the most shipments5. As explained, the majority of the PEM Fuel cells correspond to fuel cell "stacks". The SmallinOne project proposes a top down integration via realization of the membrane electrode assembly using vacuum techniques. The proposed architecture uses the techniques coming from micro-electronics, for the deposition of the various layers composing the active parts of the cell. The various components of a PEM fuel cell (proton exchange membrane, electrodes and bipolar plates) are built using vacuum techniques. The proton exchange membrane of the fuel cell is required to have good proton conductivity, a lack of electronic conductivity (in order to prevent short circuit), physical/chemical stability under hydrated conditions, and low cost. The current benchmark is Nafion (Dupont), which displays a proton conductivity of around 80-90 mS/cm whilst fully hydrated at room temperature6 7 8.
1 2
http://www.myfuelcell.se/technology/micro-fuel-cells/ 2010 American Chemical Society Publication Date (Web): April 30, 2010 | doi: 10.1021/bk-20101040.ch001 In Fuel Cell Chemistry and Operation; Herring, A., et al.; ACS Symposium Series;American Chemical Society: Washington, DC, 2010. 3 Multi-Year Research, Development and Demonstration Plan, Hydrogen, Fuel Cells & InfrastructureTechnologies Program, October 2007, Table 3.4.2 4 Mini-Micro Fuel Cells: Fundamentals and Applications Par S. Kakaç, A. Pramuanjaroenkij, L.Vasiliev 5 Fuel Cell Today Portable Fuel Cell Analysis - 2010 6 Mauritz, K. A.; Moore, R. B. Chem. Rev. 2004, 104, 4535.
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Plasma polymerization offers a potentially attractive solution to the problem of manufacturing films with high acid contents (i.e. high density of proton conducting moieties) conjoined with low water solubility. The reason for this is that, unlike many conventional polymerization techniques, plasma polymerization produces thin films of insoluble cross-linked polymers9. Table 1 : Literature survey on the main results regarding the vacuum deposited proton conductive membranes for PEM fuel cells.
References N. Inagaki et al, Polym. Bull. 26, 187 (1991) Ogumi et al., Chem. Lett. 953 (1990) Ogumi et al., J. Electrochem. Soc. 137, 3319 (1990) Precursors SO2 + penta / tetra or perfluorobenzene CF3SO3H CF3CH2Cl Conductivity 0.04 mS/cm
0.025-0,05 mS/cm
Brumlik et al., J. Electrochem. Soc. 141, Trifluoroethylene and CF3SO3H 2273 (1994) Uchimoto et al. J. Electrochem. Soc. 147, 111 (2000) Roualdes et al. – J.Power Sources 158 (2006) 1270–1281 Durand et al. – J. Power Sources 195 (2010) 232–238 Methylbenzene sulfonate+1,3 butadiene CF3SO3H + styrène Styrene and trifluoromethane sulfonic acid
0.58 mS/cm
0.2 mS/cm
0.1 mS/cm
Jiang et al. - Journal of Membrane Science Styrene and trifluoromethane sulfonic acid monomers after 372 (2011) 303–313 glow discharge
180 mS/cm
The most recent of the plasma polymers in Table 1 is that of Jiang et al's triflic acid/ styrene copolymer. A very high value for the proton conductivity (measured at room temperature, fully hydrated) is quoted. However, the SEM pictures of the films after deposition (before hydration) show large cracks, Figure 1. Previous plasma polymers have also often relied on copolymerization of an acid-containing monomer together with another monomer to provide a stable polymeric backbone, Table 1. The use of a single monomer to provide both polymeric backbone and acid functionalities would be preferable since reproducibility issues associated with copolymerization are diminished.
Figure 1: SEM images of trifluoromethanesulfonic acid/styrene copolymers produced by plasma polymerization. Taken from Jiang et al. - Journal of Membrane Science 372 (2011) 303–313.
Fontanella, J. J.; Wintersgill, M. C.; Chem, R. S.; Wu, Y.; Greenbaum, S. G. Electrochim. Acta 1995, 40, 2321 8 Mikhailenko, S. D.; Guiver, M. D.; Kaliaguine, S. Solid State Ionics 2008, 179, 619 9 Yasuda, H. Plasma Polymerization; Academic Press: New York, 1985
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Regarding the vacuum deposited catalysts, it is known that vacuum deposition might favour platinum nanoparticles dispersion for a reduction of the platinum amount in fuel cell. Regarding vacuum deposited catalysts for PEM fuel cells, it has already been demonstrated that plasma technologies are suitable for obtaining an efficient use of the catalyst10. Nanostructured catalytic films have been grown on silicon wafer and carbon-cloth using a combination of evaporation, microwave plasma enhanced chemical vapour deposition (PECVD), and sputtering methods. Most of the studies are related to ultra-fine particles production and direct metal catalyst deposition on a support11. Sun et al.12 tried to deposit Pt nano-particles on nitrogen containing CNTs (CNx NTs) for micro-fuel-cell application. The CNx NTs were grown on Si substrate through microwave-plasma-enhanced chemical vapour deposition (MPECVD). For Pt deposition, a DC sputtering technique was employed. Some well separated Pt nano-particles were formed with an average diameter of 2 nm on CNx NTs while a continuous Pt thin film was observed on the bare Si substrate. These results suggest that the sputter-deposition technique is a good way to deposit small and uniform Pt layer that could give a higher fuel cell cathode performance and, at the same time, reduce the Pt loading considerably. Recently, improved performances were showed for the co-deposition via sputtering of C/Pt catalyst layer 13. The highest utilization of platinum at ultra-low loadings has been achieved with electrodes prepared by sputtering methods with power density of 20kW/g Pt (pure H2 and O2 gases). This result is attributed to the improved dispersion of the platinum clusters which are distributed on the 300nm of the gas diffusion layer and to the fact that co-depositing carbon may favour both the efficiency and the utilization of platinum. With the objective to produce an innovative membrane electrode assembly using vacuum technologies, the SmallinOne project proposes an innovative architecture corresponding to a thin film protonic conductive membrane with two catalytically functionalized sides. The idea is to keep a same proton conductive backbone for each layer, and to functionalise it with embedded conductive catalyst particles for the electrodes. The electronic conduction is allowed by the platinum cluster percolation. The project is divided into three parts. In a first time, the objectives were to develop the basic materials, that is to say the catalysts and the ionic membrane via vacuum technologies. This happened in two steps: first, chemical precursors were developed, and second, these precursors were used to build the ionic membrane. Commercial precursors were utilized for the development of the vacuum deposited catalysts. In a second part of the project, these materials are assembled together for the fabrication of fuel cells via incorporation of the catalysts in a proton conductive matrix. Finally, the project focused on enhancing the performances via improving the electronic conductivities for example. The project is highly ambitious. The final targets are very high taking into account the various challenges we had to face: First, even if interesting chemical structure can quite easily be drawn, it is not easy to predict the physical properties of these materials, and especially to predict if these molecules can be used for vacuum deposition. Another issue is the synthesis of performing ionic membrane via vacuum techniques. Indeed, the literature already reports various paths for the synthesis of proton conductive membranes via vacuum techniques, however, these materials present ion conductivities far below from the actual target of 100 mS/cm. Another challenge comes from the fact that both the catalyst and the proton conductive membrane should be made in the same vacuum tool, with is not obvious, from a technical point of view.
10 11
C.J. Liu, G.P. Vissokov and B.W.L. Lang, Cat. Today, 2002, 72, 173 S. Mahima, R. Kannan, I. Komath, A. Aslam and V. Pillai, Chem. Mater., 2008, 20, 601 12 Sun CL, Chen LC, Su MC, Hong LS, Chyan O, Hsu CY, et al. Chem Mater 2005;17:3749e53 13 Cavarroc et al. Electrochemistry communication – Volume 11, issue 4 – April 2009
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To address these challenges, the consortium is composed of industrial partners and research centers or universities. For the material development, three partners worked in parallel, CEA, UNIBA, and an industrial partner, SIL (which was recently sold to the company P2I). CEA is involved in the characterization of the materials and fuel cells. UNIBA is involved in the synthesis and characterization of the chemical precursors. BIU developed liquid precursors for the synthesis of ionic membrane and prepared catalyst nanoparticles. The materials were evaluated and tested by IRD, which has a strong knowledge in PEM fuel cell for stationary application, and by CEA for the portable (small power range) applications. FMSP advised the consortium with its background in roll-to-roll production tools.
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2.3 Main S&T results/foregrounds
2.3.1 Membranes development
Universita degli Studi di Bari Plasma and chemical vapour deposition processes have been optimized to synthesise thin protonic membrane. Both commercially available precursors and ad hoc synthesized ones have been tested in the deposition of such coatings. The precursors consisted in organic acid and esther derivatives with a high vapour pressure in order to make easier the admission in the vacuum reactor. In any case, major attention has been devoted to monomer structure retention in the membrane by limiting monomer fragmentation and loss of the relevant acid functional group during the deposition process. Furthermore in the case of precursor in esther or other derivatives form, the deposited film have been treated in a wet hydrolysis step to convert the functional groups in acid moieties. The approach followed in the case of plasma deposition processing was that of working at low RF power with eventual addition of a fluorocarbon monomer to the functionalised precursor. Changing the ratio of the two monomers could help in tuning the acidity of the functional groups (which depends both on the content of the acid groups and on the presence of electronegative groups that withdraw electrons – CFx) and the wettability/water management of the membrane (increasing the content of fluorocarbons groups the hydrophobic character increases). In Figure 2 the effect of RF power on the chemical coating composition in terms of infrared absorption is reported, for a typical system studied in SMALLINONE at a constant feed composition (acrylic acid, AA / exafluoropropene, C3F6). It can be observed that the acid groups (3000-3600 cm-1) drastically decrease when the power is increased as a matter of boosted fragmentation in the gas phase. On the other hand coatings deposited at low power are more susceptible to water dissolution.
AA= 6 sccm C3F6= 1 sccm
Absorbance (a.u.)
Wavenumber (cm )
Figure 2 – FTIR spectrum for membrane coatings deposited by plasma processing
However, with this approach membranes with protonic conductivity as high as 70mS/cm can be obtained.
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Another approach followed at UNIBA consisted in the use of initiated Chemical Vapor Deposition (iCVD). In this case in a vacuum reactor a hot wire (about 300°C) breaks a radical initiator forming reactive species that diffuse towards a chilled substrate at T=1050°C where it can react via a conventional radical polymerization, with vinyl precursors (Figure 3). Different precursors have been tested, similar to the ones tested in plasma processing, with and without the addition of crosslinkers, such as ethyleneglycoldimethacrylate.
filament wires T ~ 280-300°C
adsorbed monomer
polymer I-M I-Mn substrate T < 60°C
Figure 3 – scheme of iCVD process
fMAA 20% fMAA 50% fMAA 80%
Wavenumber (cm )
Figure 4 – FTIR spectra of PFDA/methacrylic acid iCVD deposition
Also with this process the relative abundance of fluorocarbon and acid groups bearing precursors has been evaluated. In Figure 4 it can be observed how playing with the flow rate of the two precursors and their partial pressure in the vacuum chamber the composition of the coatings can be nicely tuned. This method can allow deposition rates as high as 500nm/min and the best proton conductivity attained was 70mS/cm.
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Commissariat à l'Energie Atomique et aux Energies Alternatives CFS and CFO membranes were realized by using a capacitive-coupled reactor with a RF power supply of 13.56 MHz. The radio frequency (RF) power is delivered by a Dressler Cesar 1310 generator to the showerhead-type upper electrode. Vacuum is made by a dry two-stage Alcatel ADS601 pumping system. Pressure is measured via MKS Baratron® gauges and controlled by a VAT throttle valve system. A base pressure of 10 -3 mbar was reached before each deposition. The precursor is vaporized at room temperature and vapours are carried by inert Helium from a thermostatic bubbler to the chamber. The CFS membranes results from the plasma polymerization of PSEVPE with C4F8. The plasma power was fixed at 10W, the deposition pressure was fixed at 0.25mbar and the sample holder temperature was varied between 35°C and 200°C. The graph from the Figure 5 shows the impact of the deposition temperature on the chemical composition of the CFS films (FT-IR spectra). For all deposition temperatures, one notices the presence of CF2 stretches (at 1150 and 1210 cm-1) and of the CF stretch (at 1260 cm-1). The shoulder at 1470cm-1 can be attributed to the SO2 bonds and the peak at 990cm-1 is characteristic from the C-O-C bonds. The CF2 stretches are clearly resolved. This denotes a quite ordered nature in the CF2 chains. This order is strongly correlated to the plasma power. As shown in the Figure 6, the lack of any distinction between the two CF2 stretches suggests an amorphous and disordered film matrix which is deposited for the high power films. The large peak between 1100cm-1 and 1400cm-1 is related to an overlap of the CF2 stretches (1150 and 1210 cm-1) and the CF stretch (1260 cm-1). From a deposition temperature between 150 and 200°C, one can see on the Figure 5 a decrease of the SO2 peak intensity. We assume that this is related to the plasma assisted thermal degradation of the C-S bonds of the per fluorinated PSPVE molecule. This is mainly correlated to the thermal decomposition of the SO2 bonds and this prevents us from working at temperatures superior to 150°C for the realization of the AllinOne material with the sulfonic bonds.
intensity (a.u.)
COC bonds SO2 bonds
0 800
wave number (cm-1)
Figure 5 : FTIR spectra for CFS membrane deposited according the following conditions : Heb 100sccm, C4F8 80sccm, P 10Watt, Die 20mm, deposition temperature from 60°C to 200°C.
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intensity (a.u.)
increased plasma power
1100 1200 1300 wave number (cm-1)
Figure 6 : Impact of the plasma power on the FTIR spectra for CFS membrane deposited according to the following deposition conditions: Heb 100sccm, C4F8 80sccm, P 20-200Watt, Die 20mm, deposition temperature 35°C.
The CFO membranes results from the plasma polymerization of C4F8 with H2O vapours. The Table 2 recapitulates the compared results for a PECVD CxFyCOOH film and a commercial membrane. One observes a stronger dispersion of the results for the PECVD membrane. For both membranes, we checked that the substrate had no influence on the measured value. The residual depth is weak for both membranes, which is characteristic of elastic materials. Creep is huge for both membranes. PECVD CxFyCOOH membranes are four times harder than the commercial membranes. To decrease the hardness of the CxFyCOOH membranes, pulsed plasma deposition was tried. These last are expected to impact the reticulation of the CxFyCOOH membranes and thus the mechanical behaviour. The duty cycle was fixed at 50 and the pulsed frequency was varied between 1Hz and 5Hz. No impact was seen on the FTIR spectra, meaning that the kind of chemical bonds stay unchanged. Table 2. Results for PECVD and commercial membranes. Sample Thickness (μm) Indentation depth (μm) Maximal strenght (mN) Creep (μm)* Residual depth (μm)* Young modulus at 10% (GPa)** Hardness at 10% (GPa)** Commercial membrane 20 2 3,1 0,2 1,2 0,78 0,06 CxFyCOOH
8 2 15,1 0,1 1,3 3,45 0,24
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Surface Innovations Limited One main objective was to screen further a range of existing SIL precursors previously used for plasma deposition of proton conducting membranes. Out of these, plasma-enhanced deposition of anhydride-containing precursors was found to display high proton conductivity values. Effectively this provides a single-step process for preparing proton exchange membranes at ambient temperatures.
Substrate H2O
Figure 7 : Hydrolysed membrane layers
The resultant hydrolysed membrane layers contain a high density of carboxylic acid functionalities, which underpin proton conductivity (Figure 7). Carboxylic acids are weaker acids compared to the more popular sulfonic acid groups (as used in the current benchmark perfluorosulfonic acid containing polymer membranes (Nafion ®) and therefore have in the past been reported to yield low proton conductivities. However, the present study demonstrates that hydrolysis of anhydride functionalities can lead to a high density of proton conducting carboxylic acid centres.
Table 2: Water Uptake, Proton Conductivity, Water Contact Angle, and Stability in Water at 20 °C of Plasma Deposited Films. Hydrated Plasma Mass Increase Proton Water Contact Optical Deposited Film Upon Hydration / Conductivity (fully Angle / ° Appearance wt % hydrated, 20° C) / -1 mS cm Poly(maleic anhydride) Poly(trifluoromethylmaleic anhydride) 167 ± 7 143 ± 3 50 ± 5 90 ± 5 38 ± 1 84 ± 1 Cracking No cracking
For the case of pulsed plasma deposited poly(maleic anhydride) and poly(trifluoromethylmaleic anhydride) films, the measured proton conductivities are on a par with Nafion (80-90 mS cm-1 at room temperature). In the case of poly(trifluoromethyl-maleic anhydride) films, a threefold beneficial effect is achieved by utilising a trifluoromethyl group substituted variant of maleic anhydride: firstly it provides stabilization of anhydride radicals within the electrical discharge (thus enhancing rate of polymerization and suppressing ablation); secondly its electron-withdrawing effect gives rise to a stronger carboxylic acid group; and thirdly, it provides a degree of hydrophobicity which helps to avoid cracking (due to less hydrophilicity and therefore swelling/internal mechanical stress within the layers). These films were characterised using XPS, FTIR, and impedance measurements. Testing for fuel cell applications by IRD was found to be unsuccessful.
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Further experiments were undertaken in relation to the atomized spray plasma deposition (ASPD) of the sulfonate ester provided by UNIBA (Figure 8).
Figure 8: Structure of UNIBA monomer.
The UNIBA monomer was deposited under both continous wave conditions and pulsed conditions without using the ASPD setup (i.e. conventional plasma polymerization at a vapour pressure of 0.18 mbar). This gave low film deposition rates of 6 nm min-1 for the continuous wave and 2.7 nm min-1 for the pulsed deposition. Though the films were smooth and of good quality, their low thickness rendered them not easily analyzable. In contrast, the atomised spray-plasma-deposited films were very thick (with a deposition rate in the order of 100's of nanometres per minute). This gave rise to a dark brown film, with sharp infrared peaks. There is still a significant peak due to the CF2=CF vinyl stretch after plasma deposition, but this could easily be reduced by tailoring the reaction conditions, such that the flow rate and therefore pressure inside the chamber was optimised.
% Transmission
Wavenumber / cm
Figure 9: FTIR spectra for (a) UNIBA monomer; and (b) UNIBA monomer having been spray-plasma deposited
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Catalytic electrodes development
Universita degli Studi di Bari UNIBA had to optimize nano-composite coatings consisting of platinum clusters embedded in a polymeric matrix by means of plasma deposition. The approach consisted in simultaneous plasma polymerization and sputtering of a Pt target. This is depicted in Figure 10.
Figure 10: Scheme of the single step plasma deposition of Pt containing nanocomposite coatings at UNIBA
For this reason a gas feed containing both a monomer, precursor of the matrix and Argon has been considered. As monomer both fluorocarbon and inorganic gas have been considered. Chemical analysis of the surface as well as electron microscopy characterization of the coating has been carried out to assess the structure of the coating. Furthermore to define the performance of the coatings for their potential use as an electrocatalytic layer in fuel cell, the cyclovoltammetric measurements have been carried out for samples deposited on graphite rotating discs. This test gives information on the specific "active" area of the catalytic materials, and in turn, indirectly, on their efficiency of conversion of fuel. Basically 2 systems have been considered a) C2H4 + Pt target b) C3F6 + Pt target for the system a the monomer was admitted both continuously and pulsed. The second approach allows for reducing the unwanted deposition on the target that limits the sputtering of metal and in turn its amount in the coating. In this mode lower RF power can lead to higher Pt content in the catalytic layers. A typical effect of RF power on the composition of the coating is reported in Figure 11, in the case of plasma fed with C3F6. The amount of metal in the coating is increased with the power at a fixed content of monomer in the gas feed. The nanocomposite structure of the catalytic layer deposited in this way was demonstrated by means of transmission electron microscopy (TEM). In Figure 12A it can be appreciated that the coating (about 60% atomic percent of platinum) consists of well dispersed small agglomerates of Pt clusters (less than 10nm in diameter) in a polymeric matrix. Furthermore, and this has been confirmed by chemical analysis the Pt is not oxidised, and it is organised in crystalline form.
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Much more as displayed in Figure 12B the film for Pt% higher than 55% grows columnar, as typically found in coatings deposited by classic sputter deposition. In terms of Electrocatalytic activity the results are summerized in Table 3, reported in terms of SECSA (specific electrocatalytic surface area).
Atomic concentration (%)
0 0
RF Power (W)
Figure 11: XPS elemental analysis of the surface as a function of the power ignition of the plasma, when a C3F6/Ar system is considered.
100 nm
Figure 12 : Morphological characterization of Pt/CHx coating, A) TEM and B) SEM analysis
Table 3
Process Pt/CHx continuous Pt/CHx continuous Pt/CFx continuous Pt/CHx pulsed monomer Pt/CHx continuous
thickness (nm) 500 500 500
Pt loading (mg∙cm-2) 0.342 0.513 0.652 0.56
SECSA (cm2 Pt mg-1) 85 263 94 202 173
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The following observations can be done: 1) The performance is at least comparable with the commercial catalysts 2) Hydrocarbon based monomer leads to better catalytic character 3) Even at thickness as low as 250nm a considerable catalytic activity is obtained Commissariat à l'Energie Atomique et aux Energies Alternatives MOCVD (direct liquid injection) has been used for the deposition of the C xFyCOOH/Pt coatings. The reactive species (Pt precursors Complex PtMe2(COD) purchased from Strem Chemicals) are solubilised in Toluene (Aldrich) and injected with nitrogen and oxygen at high pressure by liquid injectors. Synthesis of the proton conductive matrix occurs from the polymerization of C4F8 with water vapours which is also injected with nitrogen at high pressure by liquid injector. Platinum deposition occurs from the thermal (plasma assisted) decomposition of the precursor's carbonated ligands. Preliminary experiments were done without water, to check the ability of depositing composite CxFy/Pt films. We studied the growth rate of the films, as well as the electronic resistivity. Indeed, near the catalytic sites, low electronic resistivities are required for a good evacuation of electronic charges. The figure below shows the impact of the C4F8 flow on the growth rate, for various r.f. power. Visually, the colour of the membrane deposited in glass substrate varies from metallic grey for the low C4F8 flow to dark grey for the elevated C4F8 flow. This modification of the aspect of the films can be correlated with a variation of the Pt/C ratio in the coating. In parallel, the growth rate is strongly impacted by the fluorocarbon flow and the r.f. power, showing thus that the plasma polymerization of the fluorinated gas should have occurred. For a C4F8 flow of 100sccm, a maximal growth rate close to 100nm/min could be reached.
0 20 40 60 80
Growth rate (nm/min)
100 10
1 0 0,1 50 100 150
Fluorocarbon flow (sccm)
Figure 2 : Impact of the C4F8 flow and the r.f. power on the growth rate of CxFy/Pt films.
Fluorocarbon flow (sccm)
Figure 14 : Impact of the C4F8 flow and the r.f. 14 power on the electronic resistivity of CxFy/Pt films .
The Figure 14 presents the variation of the electronic resistivity of these same coatings. The resistivity is strongly correlated to the C4F8 flow. For C4F8 flows superior to 20sccm, the coatings are insulating, C4F8 flow as low as 5sccm are required to reach low resistivity between 10-4 and 10-6 ohm.m. The impact of the r.f. discharge is less clear. Indeed, for C4F8 flow of 5sccm, the high power coatings present the lowest resistivity of 2.10-6 ohm.m. But from C4F8 flow of 20sccm, the tendency is reversed and the resistivities seem decreased for the r.f. power of 5watt. This tendency should be confirmed, but it can be explained by the competitive action of the r.f. discharge for the platinum deposition and the polymerization of the carbon matrix. For the low C4F8 flow, an increase of the plasma power will mainly affect
Electronic resistivity superior to 10-1 ohm.m cannot be measured with our 4 probe apparatus; consequently, values of 10 ohm.m have been plotted – meaning insulating coating.
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resistivity (ohm.m)
the platinum growth rate while for enhanced C4F8 flow, event if the platinum deposition yield should probably be increased, the r.f. power mainly impacts the deposition of CxFy matrix. From these results, the C4F8 flow has been set below 20sccm. Hence, water vapours were added for formation of ion conductive carboxylic functions. As oxygen, H2O is known as an oxidative specie and act for the degradation of the carbonated ligandsi. For the trimethyl aluminium precursor, H2O introduction causes reduction of the aluminium growth rate (with respect to oxygen). This is interpreted by the different reactions of trimethyl aluminum with the oxygen species of O2 and H2O in the vapour phase prior to the growth regionii. The addition of water was shown to act positively on the growth rate for the films deposited with C4F8 5sccm, while it has a negative impact on the growth rate for the film with C 4F8 flow superior or equal to 50sccm. It was shown previously that the decreased of the CxFy growth rate is related to the formation of carboxylic functions and consequently, an equilibrium has to be found between electronic resistivity (low C4F8 flow) and ionic conductivity (C4F8 flow high enough for formation of carboxylic functions). From these results, growth conditions were chosen to reach electronic resistivity between 4.10-6 and 2.10-5 ohm.m. XPS analyses confirmed the presence of platinum, carbon, oxygen, and fluor. In parallel with the material developments, fuel cells were built onto polyimide substrates. We present here the results for the ionic membrane CFS type, deposited by PECVD, and for the catalytic materials deposited by MOCVD. The fuel cells were built according to the following stack: first, a 500nm thick gold collector was deposited via sputtering. Then a C/Pt ink (home made, from commercial catalysts – pt load 0.2mg/cm2) was deposited on the drilled polyimide substrate. The CFS membrane was then deposited under the following plasma conditions: plasma discharge 10Watt, He bubbling flow 0.1SLM, C4F8 flow 80sccm, pressure 0.25mbar, duration between 8 to 64hrs. The cathode was deposited via spraying a C/Pt ink (0.3mg/cm2). A cathodic gold collector (500nm thick) was then deposited. The open circuit voltage is the difference of electrical potential between the cathode and the anode when there is no external load connected. The theoretical value for a PEM fuel cell is of 1.23V. Practically, open circuit voltage of 0.9 to 1.1V can be measured with a majority of the commercially available PFSA materials. For thicknesses between 10 and 20µm, maximal OCV of 850-900mV are measured. These values remain stable in time but inferior to the one measured with a commercial NafionXL membranes, meaning that the hydrogen crossover through the CFS membranes is superior to the hydrogen crossover through Nafion membranes. This can be related to the low reticulation of the CFS plasma membranes since low deposition power are requires to conserve the acidic functions. Chrono amperometric curves for the CFS fuel cells at a potential / cell of 0.6V were carried on (Figure 15). Even if power outputs as high as 5mW/cm2 can be reached, the current is stabilized at values around 1mA/cm2 (0.6mW/cm2). No influence of the membrane thickness could be depicted.
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chrono amperometry open circuit voltage
0 -10 -20 0 0,1 0,2 0,3 0,4 0,5
1,2 1 0,8 0,6 0,4 0,2 0 time (hours)
-30 -40 -50 -60 -70 -80 -90 -100
Figure 15: Sample AllinOne 5, in blue, open circuit voltage and in red chrono amperometric curve for a cell potential set at 0.6V.
Surface Innovations Limited One main objective was to screen a range of existing SIL precursors previously used for plasma deposition of metal containing organic layers. Out of these, plasma-enhanced deposition of copper(II) hexafluoroacetylacetonate and platinum(II) hexafluoroacetylacetonate were chosen as suitable precursors for plasma enhanced chemical vapour deposition (Figure 16).
Figure 16: Structure of copper(II) hexafluoroacetylacetonate (the platinum(II) analogue is identical except for the 2+ 2+ replacement of the Cu with Pt metal ion).
Electron microscopy showed that for both copper(II) and platinum(II) hexafluoroacetylacetonate films metal nanoparticles (size of less than 10 nm) embedded within the film were produced.
Figure 17: TEM showing metal nanoparticles.
These films were not successfully tested in fuel cells.
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open circuit voltage (V)
intensity at 0,6V (mA)
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2.4 Potential impact and dissemination and exploitation of results
2.4.1 Potential impact
Potential impact PEM fuel cells present a huge potential for automotive and stationary applications and can also be used for portable systems in the range 50W-500W and for micro-fuel cells (5-50W), for which the power density is not the limitation, but rather the ratio power/weight. Depending from the application, the targets for success in the marketplace differ. For example, the targets for automotive fuel cells include a cost target of $30/kW by 2015 ($45/kW by 2010), 5,000-hour durability and increased efficiency to 60%. The cost target is for production at manufacturing volumes of 500,000 systems per year15,16. In other potential applications for fuel cells, such as stationary power generation (distributed power), backup power, portable power, material handling, and other specialty applications, the life-cycle cost of the competing technology allows for a higher fuel cell cost. These applications are considered early markets for fuel cells. For example, for stationary power generation key targets include a fuel cell cost of $750/kW and a durability of 40,000 hours. For Micro fuel cells, the challenges are mainly focused on the miniaturization of the systems and judicious coupling with the hydrogen sources and the specificity of the allinone architecture can clearly help in this way. Of course, costs must also be competitive and costs of $10/W are targeted but we can also point out the fact that the business model can affect this threshold value. Indeed, due to the fact that for the small systems, hydrogen will appear as a cartridge which could be disposable, the total price of the system fuel cell/N cartridge will be mainly determined by the price of the cartridge. Then costs superior to $10/W could be attractive. In the light of the results we have had, we think that the initial commercial targets of the project should be refocused on small scale, portable application rather than the more demanding automotive or stationary applications, with a particular emphasis on planar micropower fuel cells for portable devices. Indeed, the materials itself as well as the solution proposed for their integration might bring opportunities to miniaturize the systems but the materials developed until now cannot sustain the working conditions required for automotive and stationary applications. Process scalability The approach selected to assess process scalability was to use a return on investment model, to rate the economical interest of SmallinOne technology findings in front of current and targeted fuel cell performances. The inputs needed to this model are typically costs and capacity information for the tools and materials, price and volume information for the market side. It was decided to focus on the micro-fuel cells market and realistic cost and throughput expectations for SmallinOne deposition technologies were then collected from partners. Current cost and price schemes were taken out of www.quintech.de. A specific model was build to calculate typical return of investment input figures out of the available data.
15 16
Connolly, D. J.; Gresham, W. F. U. S. Patent No. 3,282,875, 1966. Mauritz, K. A.; Moore, R. B. Chem. Rev. 2004, 104, 4535.
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The output of the return on investment calculations is summarized below: The ASPD & PECVD deposition techniques are potentially profitable for next generation portable fuel cells membranes. The use of ASPD tools and ATO based Nanoparticles catalysts are potentially very profitable for next generation portable fuel cells electrodes. The use of the same ASPD equipment for both the membrane and electrodes deposition only adds to the economical interest of the SmallinOne findings. On the whole, various materials were developed with different maturity level. Even if the from a process point of view, the ASPD and the PECVD technique were found profitable for the next generation fuel cell, their behaviour still needs optimization for being useful in fuel cell systems. The catalysts systems are at an advanced maturity level and could probably be used at an industrial level within few years. 2.4.2 Dissemination and exploitation of results
The exploitation and dissemination in SMALLINONE project followed each 6 month via sessions at the project meetings and the actions were recorded carefully. At M30, an EC Exploitation Strategy Seminar was organized that helped in the brainstorming on final project results. Various publications and patents have been submitted or identified. The publications submitted by CEA, UNIBA, SIL, IRD and BIU are:
J.Thery, S.Martin, V.Faucheux, L.Le Van Jodin, D.Truffier-Boutry, A.Martinent, J.-Y. Laurent, Fluorinated carboxylic membranes deposited by plasma enhanced chemical vapour deposition for fuel cells applications, J. Power Sources, 195, 17, 5573-5580. E.Dilonardo, A.Milella, P. Cosma, R.d'Agostino, F.Palumbo, Plasma deposited electrocatalytic films with controlled content of Pt nanoclusters, Plasma Processes and Polymers, 8, 5, 452458. T.J.Wood, W.C.E.Schofield, J.P.S. Badyal, Single step solventless deposition of highly protonconducting anhydride layers, J. Mater. Chem., 22 (2012) 7831-7836. A.M.Coclite, F.Palumbo, P.Lund, R.DiMundo, R.d'Agostino, Novel hybrid fluoro-carboxylated copolymers deposited by initiated Chemical Vapor Depostion as protonic membranes, J. Mater. Chem., submitted. A.Peled, M.Naddaka, J-P.Lellouche, Controllable photodeposition of metal nanoparticles on a photoreactive silica support, J. Mater. Chem., 22 (2012) 7580-7583.
In addition, CEA presented its results at the FDFC 2011 (Fundamentals and developments of fuel cells, January 2011, Grenoble-France), and UNIBA at the XX AIV (May 2011, PadovaItaly) and CIP 2011 (June 2011, Nantes-France). Several conferences were attended as invited speaker by SIL. The consortium co-organised together with CEA-Liten and the FCH JU a workshop on "materials issues for fuel cells and hydrogen technologies" on the 26-28th of March 2012 in Grenoble, France that gathered actors in European projects on fuel cells. The workshop was connected to the final SMAllinOne meeting. CEA gave a presentation of our project and it was an occasion for the SMAllinOne consortium to exchange about the state of the art on the materials bottlenecks for fuel cells and hydrogen storage. For more information: http://www.fch-ju.eu/event/workshop-materials-issues-fuel-cells-andhydrogen-technologies
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2.5 Consortium and contact information
2.5.1 Coordinator J. THERY, firstname.lastname@example.com, www.smallinone.eu Commissariat à l'Energie Atomique et aux Energies Alternatives – France 2.5.2 Partners Universita degli Studi di Bari – Italy/ A. MILELLA, email@example.com Surface Innovations Ltd – United Kingdom/ K. ARMOUR, email@example.com Bar-Ilan University – Israel/ J-P. LELLOUCHE, email@example.com Federal Mogul Systems Protection – France/ B. LAURENT, firstname.lastname@example.com IRD Fuel Cells A/S – Denmark/ M. J. LARSEN, email@example.com ALMA Consulting Group SAS – France/ J. KERANEN, firstname.lastname@example.com
The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° NMP3-SL-2009-227177 SMAllinOne.
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3. Use and dissemination of foreground
3.1 Section A: Dissemination (Public)
3.1.1 List of scientific (peer reviewed) publications (A1) - Public
Template A1: List of scientific (peer reviewed) publications No WP Title Main author Title of the periodical or the series Number, date or frequency Publisher Place of Date of Relevant publication publication pages Permanent identifiers** (if available) Is/Will open access*** provided to this publication?
5 6
Fluorinated carboxylic membranes deposited by plasma enhanced chemical vapour deposition for fuel cells applications Plasma Deposited Electrocatalytic Films with Controlled Content of Pt Nanoclusters Single step solventless deposition of highly protonconducting anhydride layers Novel hybrid fluorocarboxylated copolymers deposited by initiated Chemical Vapor Depostion as protonic membranes Controllable photodeposition of metal nanoparticles on a photoreactive silica support Joint BIU/ SIL publication: 'Highly Proton Conducting
Jessica Thery/ CEA Antonella Milella/ UNIBA J. P. S. Badyal/ SIL
Journal of Power Sources
Volume 195, Issue 17
Plasma Volume 8, Processes Issue 5 and Polymers Journal of Materials Chemistry Journal of Materials Chemistry Journal of Materials Chemistry Chemistry of Materials Volume 22, Issue 16
Fabio Palumbo/ UNIBA Jean-Paul Lellouche/ BIU J. P. S. Badyal/
Volume 22 Planned in 2012
No No
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SIL Jean-Paul Journal of Planned mid7 WP1,5 Joint BIU/ IRD publication Lellouche/ Materials RSC TBD TBD No 2012 BIU Chemistry * A permanent identifier should be a persistent link to the published version full text if open access or abstract if article is pay per view) or to the final manuscript accepted for publication (link to article in repository). ** Open Access is defined as free of charge access for anyone via Internet. Please answer "yes" if the open access to the publication is already established and also if the embargo period for open access is not yet over but you intend to establish open access afterwards.
List of dissemination actions (A2) - Public
Template A2: List of dissemination activities No WP and (if applicable) result number Type of activities* Main Title/ Subject/ Reference leader Actual/ Place planned date or status Type of Size of audience** audience Countries addressed Draft Final received version (Yes/No) received (Yes/Noanticipated date DDMMYY) Yes Yes
Global project
Website, brochure
Global project
Public summary
Public executive summary
Released May-June 2010 Released 20/05/10, 22/11/10, 17/05/11, 18/11/11 and 23/05/12
All public
All public
J.Thery, S.Martin, V.Faucheux, L.Le Van Jodin, D.TruffierBoutry, A.Martinent, J.-Y. Laurent, Fluorinated carboxylic CEA membranes deposited by plasma enhanced chemical vapour deposition for fuel cells applications, J. Power Sources, 195, 17, 5573-5580. UNIBA E.Dilonardo, A.Milella, P.
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Oral presentation Oral presentation (invited) Other : FCH JU corporate leaflet
7 8
WP2 Global project
Cosma, R.d'Agostino, F.Palumbo, Plasma deposited electrocatalytic films with controlled content of Pt nanoclusters, Plasma Processes and Polymers, 8, 5, 452-458. FDFC 2011 – Fundamentals and developments of fuel cells, PECVD synthesis of thin proton CEA exchange membrane for micro fuel cells, D. Truffier-Boutry, J. Thery, A. Martinent XX AIV- Plasma deposition of Pt-based nanocomposite films UNIBA as electrocatalysts in micro fuel cells CIP 2011- Plasma processes UNIBA for fuel cell applications CEA Public executive summary
Grenoble (F)
1719/05/2011 4-8/06/2011 March 2012
Padova (Italy) Nantes (France) -
Italian conference (Academic, Industrial) All All
Scientific All public
>500 -
Yes Yes
Yes No
Global project
Oral presentation (invited)
FCH JU workshop on "Materials issues for Fuel Cells and Hydrogen Technologies: from 26CEA innovation to industry". 28/03/2012 SMALLINONE project presentation. T. J. Wood, W. C. E. Schofield, J. P. S. Badyal, Single step solventless deposition of highly SIL protonconducting anhydride 12/03/12 layers, Journal of Materials Chemistry 22 (2012) 78317836. Anna Maria Coclite, Fabio Palumbo, Peter Lund, Rosa Di Mundo, Riccardo d'Agostino, UNIBA Novel hybrid fluoroSubmitted /IRD carboxylated copolymers deposited by initiated Chemical Vapor Depostion as protonic membranes, Journal of
Grenoble (F)
To receive
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13 14
WP3,5 WP1,5 Global project Global project Global project Global project Global project Global project Global project Global project Global project
Publication Publication Oral presentation (invited) Oral presentation (invited) Oral presentation (Plenary) Oral presentation (invited) Oral presentation (Plenary) Oral presentation (Plenary) Oral presentation (Plenary) Oral presentation (Plenary) Oral presentation (Plenary)
Materials Chemistry Anna Peled , Maria Naddaka and Jean-Paul Lellouche, Controllable photodeposition of metal nanoparticles on a photoreactive silica support, J. Mater. Chem., 2012, 22, 75807583. DOI: 10.1039/C2JM16785A. J. P. S. Badyal et al., 'Highly Proton Conducting Layers', Chemistry of Materials In Journal of Materials Chemistry International Conference on Plasma Processes and Applications
Planned in 2012 Planned mid2012
Scientific Scientific
All All
No No
No No -
16 17
Kirchber g, 5-7/7/2010 Luxembo urg 240th American Chemical Boston, 22-26/8/2010 Society (ACS) National Meeting USA, 5th International Conference on Wellingto Advanced Materials and 7-11/2/ 2011 n, New Nanotechnology (AMN-5) Zealand Danbury, 8th International Conference on 20-22/6/ 2011 Connecti Polymer Surface Modification cut, USA 5th International Conference on Alvor, Developments in Materials and 27-29/6/ 2011 Portugal Emerging Technologies 6th International Conference on 17Krakow, Surfaces, Coatings, and Nano20/10/2011 Poland Structured Materials 3rd International Conference on New 14Atomic, Molecular, Optical & Delhi, 16/12/2011 Nano Physics India nd 2 International Conference of New 18Nanomaterials and Delhi, 21/12/2011 Nanotechnology India International Conference on Ahmeda Supramolecules and 6-8/2/2012 bad, Nanomaterials (ICSNA 2012) India
Scientific Scientific
>100 >100
International No International No
No No
International No
International No
International No
International No
International No
International No
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24 25
Global project Global project
Oral presentation (Keynote) Oral presentation (Invited)
33rd Australasian Polymer Conference Smart Coatings 2012 Conference
12-15/2/2012 22-24/2/2012
Hobart, Australia Florida, USA
Scientific Scientific
>100 >100
International No International No
No No
* A drop down list allows choosing the dissemination activity: publications, conferences, workshops, web, press releases, flyers, articles published in the popular press, videos,
media briefings, presentations, exhibitions, thesis, interviews, films, TV clips, posters, other. ** A drop down list allows choosing the type of public: Scientific Community (higher education, Research), Industry, Civil Society, Policy makers, Medias ('multiple choices' is possible.
i ii
C.G. Van de Walle. Phys. Rev. Lett., 85 (2000), p. 1012. Journal of Crystal Growth Volume 68, Issue 1, 1 September 1984, Pages 157-162
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text:
Come Rain or Come Shine
Unabridged Audiobook
Written By: Jan Karon
Narrated By: John McDonough
Publisher: Penguin Audio
Date: September 2015
Duration: 8 hours 28 minutes
#1 New York Times-bestselling author Jan Karon returns-with the story readers have been waiting for.
Over the course of ten Mitford novels, fans have kept a special place in their hearts for Dooley Kavanagh, first seen in At Home in Mitford as a barefoot, freckle-faced boy in filthy overalls.
Now, Father Tim Kavanagh's adopted son has graduated from vet school and opened his own animal clinic. Since money will be tight for a while, maybe he and Lace Harper, his once and future soul mate, should keep their wedding simple.
So the plan is to eliminate the cost of catering and do potluck. Ought to be fun.
An old friend offers to bring his well-known country band. Gratis.
And once mucked out, the barn works as a perfect venue for seating family and friends.
Piece of cake, right?
In Come Rain or Come Shine, Jan Karon delivers the wedding that millions of Mitford fans have waited for. It's a June day in the mountains, with more than a few creatures great and small, and you're invited-because you're family.
By the way, it's a pretty casual affair, so come as you are and remember to bring a tissue or two. After all, what's a good wedding without a good cry?

subset: commoncrawl


text:
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text:
"I'm asking you to consider hiring me for the hardest job in the world," Sen. Hillary Clinton, D-N.Y., told nearly 4,100 people at a rally at the Rhode Island College Recreation Center Sunday afternoon.
Clinton's visit follows in the footsteps of Sen. John McCain, R-Ariz., and Michelle Obama, who have both visited Rhode Island in the last few weeks.
Rhode Island's March 4 primary is especially important for Clinton, who has lost 11 straight primary contests to rival Sen. Barack Obama, D-Ill. Obama also has more committed delegates nationwide. But a Feb. 9-10 poll conducted by Professor of Political Science Darrell West found Clinton leading Obama in Rhode Island, 36 to 28 percent.
In her address, Clinton emphasized that she has the "strength and experience" to lead the country forward.
"There is no contradiction between change and experience," she said.
Without naming him, Clinton attacked Obama for having a naive vision of how to solve the country's and the world's problems.
"I could stand up here and say, 'Let's just get everybody together. Let's get unified,' " Clinton said. "The sky will open, the light will come down, celestial choirs will be singing and everyone will know we should do the right thing, and the world will be perfect."
"Maybe I've just lived a little long," she said, prompting laughter and cheers from the crowd.
Clinton said the biggest difference between her and Obama is on the issue of universal health care.
Though Obama speaks about supporting universal health care, his plan does not require everyone to be covered by health insurance, Clinton said.
Clinton also criticized President Bush's handling of both foreign and domestic issues during his tenure in office.
She said though the job of any president is challenging to begin with, it will be "especially tough following George Bush and Dick Cheney."
"There's so much we have to undo as well as do," she said.
Clinton also said she would call for a gradual troop-withdrawal from Iraq within 60 days of taking office.
"I think we can begin the process of telling the Iraqis they have to take responsibility for their own country," she said.
One supporter held a sign reading, "It takes a woman to stop a war."
Clinton also promised to sign bills expanding children's health insurance and promoting stem-cell research – both of which were vetoed by President Bush.
She said she will push for an economy that benefits the average American and not just "George Bush's friends and allies, the wealthy and the well-connected."
During the rally, one supporter close to the stage fainted, prompting Clinton to say, "I'm sure it was my heated rhetoric."
Deedee Quick, an attendee from Portsmouth, said though she is undecided, she is leaning toward Clinton because she speaks on specific policy issues.
"I don't think (Obama) should learn on the job, which is what is going to happen with him, I think," Quick said.
Quick said she supports Clinton because of the senator's gender.
"I wish I didn't feel that way, but I really feel like it's time for a woman to try this," Quick said. "She's a good candidate … and somebody has got to break the barrier. I think she is capable."
Clinton's experience working at the local, state and national level makes her "best prepared" to be president, said Craig Auster '08, one of the co-leaders of Brown Students for Hillary.
Auster, who finds it "unfortunate" that most Brown students are rooting for Obama, said Clinton should be the "clear choice" for college students because she has a better plan to make college more affordable, to create jobs and to provide health care for "people our age."


text:
When exposed to ordinary light, the animals become unparalyzed and wake up. Their study appears in the Journal of the American Chemical Society (JACS). It reports the first demonstration of such a light-activated switch in animals.
Neil Branda and colleagues point out that such "photoswitches" -- light-sensitive materials that undergo photoreactions -- have been available for years. Scientists use them in research. Doctors use light-sensitive materials and photoreactions in medicine in photodynamic therapy to treat certain forms of cancer. Those light-sensitive materials, however, do not have the reversibility that exists in photoswitching.
The JACS report describes development and successful testing of a photoswitch composed of the light-sensitive material, dithienylethene. The scientists grew transparent, pinhead-sized worms (C. elegans) and fed them a dithienylethene. When exposed to ultraviolet light, the worms turned blue and became paralyzed. When exposed to visible light, the dithienylethene became colorless again and the worms' paralysis ended. Many of the worms lived through the paralyze-unparalyze cycle. Scientists were not sure how the switch causes paralysis. The study demonstrates that photoswitches may have great potential in turning photodynamic therapy on and off, and for other applications in medicine and research, they indicate.
Neil Branda | Newswise Science News
Further information:
Further reports about: > Beam > C. elegans > JACS > LIGHT > Molecular Target > Photoswitches > dithienylethene > light-sensitive materials > paralysis
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Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China's then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient's body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Munich conference on asteroid detection, tracking and defense
13.06.2018 | Event News
2nd International Baltic Earth Conference in Denmark: "The Baltic Sea region in Transition"
08.06.2018 | Event News
ISEKI_Food 2018: Conference with Holistic View of Food Production
05.06.2018 | Event News
Graphene assembled film shows higher thermal conductivity than graphite film
22.06.2018 | Materials Sciences
Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle
22.06.2018 | Earth Sciences
Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View
22.06.2018 | Life Sciences


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If the Economy Is a Ship, The Crow's Nest Is a Lab
Preview | Follow-Up
I f you want to know what the future holds, one obvious place to start looking in this technology-driven economy is in its research labs. Or as Stephen Millett, manager of Battelle's Breakthrough Center, puts it, "Anything new 10 years from now should be in the lab today."
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a group or committee of persons sent to a foreign country to conduct negotiations, establish relations, provide scientific and technical assistance, or the like
the business with which such a group is charged
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a sending or being sent for some duty or purpose
those sent
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a group of persons sent by a church to carry on religious work, especially evangelization in foreign lands, and often to establish schools, hospitals, etc
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a similar establishment in any region
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missionary duty or work
an organization for carrying on missionary work
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Next Lincs Lotto draw on Sat 23 June at 8PM
The draw is in 5 days 11 hours 40 minutes
The Community Cinema provides a much loved and valued service for the community.
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Thank you for your support and good luck!
Yours sincerely
Mrs Julie Reed
Mrs H supported Helping Dog Paws with 2 tickets
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2 days ago
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4 days ago
Mr O supported Scunthorpe and District Mind with 5 tickets
5 days ago
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Has the great American experiment in diversity ended in failure? That's the impression you might get from an array of recent developments — Black Lives Matter protests, anti-Muslim sentiment, resentment of unauthorized immigrants and, last but not least, Donald Trump. We seem to be loudly fracturing and separating, not coming together.
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Chicago Tribune: Is American Multiculturalism A Failure?
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