Abstract
Recently, the strong chemical interaction between Ni and GDC (Gd2O3‒CeO2) was reported for the Ni‒GDC cermet anode in solid oxide fuel cells (SOFCs); CeO2 species migrated on the Ni surface after the exposure to the reducing atmosphere. This surface modification of nickel affected the catalytic property for carbon deposition and CO adsorption. Generally, such a chemical interaction is promoted by the oxidation-reduction (redox) treatment. In this study, then, the influence of redox treatment on the chemical interaction between Ni and doped ceria was studied to design the cermet anode with high tolerance to carbon deposition. The Ni‒GDC cermet subjected to the redox treatment showed high tolerance to carbon deposition. Furthermore, the redox treatment did not affect the mechanism of electrochemical hydrogen oxidation in humidified hydrogen atmospheres.
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