Performance and Limitations of Nickel?Doped Chromite Anodes in Electrolyte?Supported Solid Oxide Fuel Cells

Ni-doped chromite anodes were integrated into electrolyte-supported cells (ESC) with 5×5 cm2 size and investigated in fuel cell mode H2/H2O gas. Both a stoichiometric nominally A-site deficient anode material showed promising performance at 860 °C approaching the ones of state-of-the-art Ni/Gd-doped ceria (CGO) anodes. While difference polarization resistance was small, an increased ohmic perovskite observed, which is related to their limited electronic conductivity. Increasing electrode thickness shown enhance stability considerably. Degradation current density, suggesting its dependency on potential, could be reversed by redox cycling. Sulfur poisoning 20 ppm hydrogen sulfide led rapid voltage drops for It discussed that Ni nanoparticle exsolution facilitates dissociation extent it not rate-limiting temperature unless insufficiently thick employed or sulfur impurities are present feed