Electrochemical Oxidation of H 2 and CO in Fused Alkali Metal Carbonates

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Abstract
By using meniscus electrodes and shift gases of relatively low content, it was possible to study the electrochemical oxidation of in molten carbonate with little interference by . Data are presented which indicate that the reaction proceeds with negligible activation polarization on Ni, Au, Pt, and Pt‐Rh alloy. The observed over‐voltages are explained as diffusion over‐voltages for , , and . Hydrogen diffusion through metal was appreciable for thin Ni membranes and very fast for Pd wires. The oxidation is far more complex and proceeds in stages. At low polarizations the rates are very small but increase greatly above approximately 200 mV. Applied to fuel cell anodes, the results suggest that, in order to utilize large content gases efficiently, internal shifting is required.

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