Electrochemical oxidation of dry CO/H 2 mixtures on symmetrical Ni and ceria pattern anodes on YSZ electrolyte has been examined between 700-850 o C. Dry environment was used to exclude the possible side reactions like water-gas-shift (WGS) in the case of CO and CO/H 2 mixtures. Electrochemical impedance spectroscopy (EIS) showed 2.5 times higher polarization resistance for pure CO as compared to that of pure H 2 for Ni anodes and 5 times higher in case of ceria anodes. With the addition of small quantities of H 2 in CO, the polarization resistance dropped drastically. For all considered mixtures, the size of impedance arc was closer to that of pure H 2 as compared to that of pure CO. The activation energies obtained by equivalent circuit model (ECM) fitting of impedance spectra were similar to that of pure H 2 clearly indicating that H 2 is preferentially oxidized.
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