Recently, Kubota has reported the strong chemical interaction between Ni and GDC (Gd2O3‒CeO2) for the Ni‒GDC cermet anode in solid oxide fuel cells ; CeO2 species migrated on the Ni surface after the exposure to the reducing atmosphere. Generally, such a chemical interaction is promoted by the 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 in dry methane. Furthermore, the redox treatment did not affect the mechanism of electrochemical hydrogen oxidation in wet hydrogen atmospheres. We also demonstrated the stable power generation of the single cell with the optimized Ni‒GDC anode in a wet methane atmosphere.
This study was supported by Japan Science and Technology Agency (JST), CREST.
Reference  J. Kubota, The 23th Symposium on Solid Oxide Fuel Cells in Japan, Extended Abstract, p34-37 (2014).