Activity of methane oxidation by the cermet anode highly-dispersed with solid-solution alloy particles

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Substitution of Co atoms for Ni atoms in the Ni-based cermet anode resulted in a decrease in the anodic overvoltage and interfacial resistance between the anode and electrolyte. This effect has been confirmed for a samaria-doped ceria (SDC) electrolyte and a scandia-stabilized zirconia (ScSZ) electrolyte. The results of electrochemical measurements revealed that the enhancement of the direct oxidation of methane was caused by the modification of microstructure in the cermet anode. Based on the experimental results a model for the anodic oxidation mechanism at the interface between the anode and electrolyte is proposed. The adsorptive abilities of Ni_<1-x>Co_x-YSZ and Ni_<1-x>Co_x-CeO_2 cermet particles for CH_4 and CO were affected by the amount of the Co atoms substituted for the Ni atoms.