Abstract
Doped yttrium chromites as potential anodes for SOFC are studied with respect to the electrode performance and anode reaction mechanisms. Both electrical conductivity and electrode performance of yttrium chromites have been enhanced after Ni doping. Electrochemical impedance spectra results indicate that charge transfer process at high frequency and surface adsorption/diffusion processes at low frequency domain can be the dominant anode reaction steps. Ni doping accelerates the surface processes and improves the charge transfer process probably by increasing the amount of adsorbed H on the electrode surface. A model of H2 oxidation reaction is proposed, revealing this dependence stems from the reaction between adsorbed H and the lattice oxygen.
Published Version
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