S0305-2-2 支持膜式SOFCアノードの繰返し再酸化による劣化・破壊挙動(SOFC構成材料の信頼性(2))

概要

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The effect of current density during electrochemical oxidation and amount of oxidation on the microstructure of solid oxide fuel cell anodes was investigated. Anode-supported cells were subjected to electrochemical oxidation by oxide ions and chemical reduction by H_2 gas. Two anodes were electrochemically oxidized by the same quantity of electricity of 15 Coulomb and at different current densities of 25 mA/cm^2 and 250 mA/cm^2. When Ni particles were oxidized at 25 mA/cm^2, little morphological change occurred in the Ni particles. On the other hand, when Ni particles were oxidized at 250 mA/cm^2, the morphology of the particles changed. Neither cell showed a decrease in OCV values or cracks in the electrolyte, which indicates that there was no oxidation by air. Therefore, the microstructure changes observed in the tested cells were caused by electrochemical oxidation and subsequent reduction (redox cycle). This suggests that the differences in the resulting microstructures of the Ni particles were caused by the differences in current density during electrochemical oxidation.
一般社団法人日本機械学会の論文
2009-09-12