Carbon deposition on Ni/YSZ anodes exposed to CO/H_2 feeds

摘要

Solid oxide fuel cells (SOFC) can be operated with a variety of fuels. In anode-supported SOFC, these fuels may decompose or react catalytically in the anode compartment resulting in mixtures that, in most cases, include high concentrations of H_2 and CO. In this study, the formation of carbon from CO and H_2 mixtures on Ni/YSZ anodes at 1073 K has been investigated using electrochemical and carbon characterization techniques. More carbon is deposited when Ni/YSZ anodes are exposed to CO/H_2 mixtures than to pure CO. Polarization of the anodes reduced the amount of carbon deposited but the extent of the reduction depended on the gas composition.