The catalyst (porous Pt film) is prepared on yttria stabilized zirconia (YSZ) tube (Ortech, 2 mm thickness, 25 mm diameter and 245 mm length) by brush painting the organometallic Pt paste (Fuel Cell Materials) followed by a heat treatment at 900 °C for 2 h in air. The crystal structure and purity of the catalyst were determined by X-ray diffraction (XRD, Bruker, Cu Kα radiation, λ = 1.54056 Å) in the Bragg-Brentano configuration. Diffractograms were collected at a scan rate of 0.02°in the 2θ range of 20°-90°. Surface composition of the Pt film was investigated by X-ray photoelectron spectroscopy (XPS, ThermoFisher Scientific, K-alpha instrument). The surface morphology of the as prepared catalyst (Pt/YSZ) was characterized using a scanning electron microscope (FEI Quanta 3D FEG instrument) at an acceleration voltage of 3-5 keV (Fig. and). The Pt film has a porous structure and consists a network of percolated particles of the order of micron and thickness is around 14 µm. SEM micrographs before and after plasma experiments show no difference since the Pt catalyst is 15 cm far from the tail of active plasma area. This is in good agreement with the minimal temperature increase on the catalyst (i.e. 1-2 °C) upon plasma ignition. The catalyst geometrical area is 20 cm 2 , while the loading is 5 mg of Pt per cm 2 . The surface area of the catalyst was determined by hydrogen adsorption with potential deposition method and it was found to be 230 nmol of Pt adsorption sites.