Electrochemical reduction of aqueous NaOH captured CO2 species (NaHCO3, Na2CO3) at -0.7 V vs. RHE showed poor FECO (<3%, Figure ). Reduction of the captured CO2 in glycolic NaOH solution (Scheme 1, eq 4) was hence explored, after adding tetrabutylammonium tetrafluoroborate (TBABF4, 0.15 M) as supporting electrolyte and 20% v/v MeCN as co-solvent to ensure a homogeneous solution. The CoPcNH2@MWCNT catalyst, a CuxPdy alloy, and a Ag/AgNO3 (0.1 M n-Bu4NPF6 in MeCN) electrode was used as working, counter (EG oxidation), and reference electrode, respectively, and the applied potentials were converted to the Fc/Fc + scale. CV scans in this medium showed an onset potential of -1.7 V vs. Fc/Fc + . Subsequent CPE studies (for 10 h) revealed an optimum CO production at -1.85 V vs. Fc/Fc + with 19.0±1.4% FECO (Figures ). Isotopic labelling experiments with captured 13 CO2 in both the aqueous (TEA/H2O) and non-aqueous (NaOH/EG) medium showed only C labelled CO as reduction product during FTIR analysis of the headspace gas, confirming that CO was derived from captured CO2 (Figure ). ) with CoPcNH2@MWCNT cathode in a two-compartment three-electrode configuration. b, Product amount (normalized to geometric surface area of the electrode) and CO faradic efficiency (FECO) for TEA captured CO2 reduction at different potentials with CoPcNH2@MWCNT electrode. c, Captured CO2 amount (CO2 flowrate 30 mL min -1 ; capture duration, 2 h), and observed FECO for different amines after controlled potential electrolysis (CPE) at -0.7 V vs. the reversible hydrogen electrode (RHE) for 1 h (conditions for a-c: Catholyte, capture solution with 0.1 M added K2SO4; anolyte, 0.1 M K2SO4; cathode, CoPcNH2@MWCNT; anode, Pt mesh; bipolar membrane). d, FECO for reduction of NaOH captured CO2 products in aqueous medium at -0.7 V vs. RHE for 1 h. e, FECO obtained after CPE of CO2 captured by glycolic NaOH solution at different potentials (conditions: catholyte, capture solution with added 20% v/v MeCN and 0.15 M tetrabutylammonium tetrafluoroborate (TBABF4); anolyte, 0.6 M NaOH, 0.15 M TBABF4 in 20% v/v MeCN in ethylene glycol (EG); cathode, CoPcNH2@MWCNT; anode, Cu26Pd74 alloy; bipolar membrane). f, Fourier transform infra-red (FTIR) spectra of the headspace (CO region) after isotope labelling experiments with both TEA/H2O and NaOH/EG system using captured CO2 as reactant where the CO signal was obtained from an experiment with captured 12 CO2. All experiments were carried out at room temperature.