S0305-2-3 SOFC発電特性に及ぼすNi-SDC/LSGM界面反応形成相の影響(SOFC構成材料の信頼性(2))

概要

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Reaction compounds formed at anode/electrolyte interface would affect not only initial SOFC performance but also long term durability. In this study, reaction between Ni-SDC and LSGM was investigated in connection with SOFC performance of Ni-SDC/LSGM/SSC single cells. La and Mg in LSGM diffused into Ni-SDC during anode fabrication. The cell performance was evaluated by AC impedance spectroscopy for the cells with anode fabricated at different temperature. Three arcs were found in the complex impedance plots of the cell with anode fabricated at 1250℃; a high-frequency (HF) arc, an intermediate frequency (IF) arc and a low frequency (LF) arc. The LF arc was considered to be originated from the gas diffusion in the flow channel. From the temperature dependence of the ASR, the origin of the IF arc was concluded to be the anode activation polarization. The HF arc was found to be independent of the anode thickness but depend on the anode fabrication temperature. Therefore, the HF arc would be originated from the reaction compounds at the anode/electrolyte interface.
社団法人日本機械学会の論文
2009-09-12