成果報告書 2019年3月

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成果報告書詳細
管理番号20180000000525
タイトル*平成29年度中間年報 固体酸化物形燃料電池等実用化推進技術開発/固体酸化物形燃料電池の耐久性迅速評価方法に関する基礎研究
公開日2019/3/23
報告書年度2017 - 2017
委託先名国立研究開発法人産業技術総合研究所 一般財団法人電力中央研究所 TOTO 株式会社 日本特殊陶業株式会社 日本ガイシ株式会社 株式会社村田製作所 国立大学法人九州大学 国立大学法人京都大学 国立大学法人東北大学 国立大学法人東京大学
プロジェクト番号P13001
部署名次世代電池・水素部
和文要約
英文要約Title: Technology development for SOFC commercialization promotion. Basic study on rapid evaluation method of SOFC durability (FY2013-FY2019) FY2017 Annual Report

Durability tests were finalized on seven different stacks. MPHS stacks exhibited excellent cell performance for long period of time such as 30,000 h with/without Cr containing vapors. Effects of Cr containing vapors are found to be very small; cathode degradation can be evaluated to be small enough even after 160,000 h, and the corresponding microstructural changes in cathode and SDC interlayer caused by Cr are also found to be small. After the improvement in filtering air in CRIEPI, other intermediate-temperature stacks exhibited reasonable cathode performance as follows: Those Kyocera cells tested by Osaka Gas for 30,000-40,000 h are found to have only a small amount of impurities(Cr,S) deposited in cathodes in good agreement with performance data. TOTO 2016 FY cells exhibit a small degradation for cathode, ohmic loss and anode after the improvement of cathode performance. NGK SPARK PLUG cells exhibit some effects on impurities such as K in cathode and P in anode, leading to different degradation mechanisms from other stacks. NGK INSULAORS cells improved cathode performance without any peculiar behavior but anomalous ohmic loss increase remains unresolved. Murata cells show a large ohmic loss increase after some improvement of cathode degradation. Denso cells exhibit a rather large cathode degradation which can be ascribed to cross leak across the cell. Contamination of air with sulfur in CRIEPI site makes is possible to consider the mechanism of affecting cathode performance by changes in thickness of YSZ electrolyte, microstructural feature (porous or dense) of ceria interlayer or humidity in anode. This leads to establishment of more general cathode degradation model based on those surface composition changes of Sr or Co on LSCF which can be controlled by (1)reactions with impurities (Cr/S), (2)interactions with protons in cathode to enhance the Sr volatilization, and (3)diffusion of Sr/Co from inside to surface of LSCF. Many issues extracted from the stack degradations has been analyzed by simulation technology: Electrode performance loss was evaluated/predicted from the observed changes in microstructure of electrodes. Since the electrical conductivity degradation of YSZ was found to be complicated and affected by many factors such as temperature, cathode/anode overpotential, current density etc, simulation technology was established to predict electrical conductivity as functions of location in YSZ electrolyte and operation time. Detailed comparison with experimental results enables to find out additional kinetic effect appearing at lower temperatures. Correlation between cathode and ohmic loss degradation leads to considerations on current constriction inside cells from micro to macro scales.
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