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The investigation of in-situ protection effect of LaCo0.6Ni0.4O3-δ cathode contact layer on high temperature oxidation of Fe-16Cr alloy as solid oxide fuel cell interconnect
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.jallcom.2020.154904
Jiawen Pan , Zhao Fan , Dong Yan , Jiajun Yang , Jian Pu , Bo Chi , Jian Li

Abstract The cathode contact material is one of the main components in planar solid oxide fuel cell (SOFC) stack for its role in maintaining stable electrical connection and forming protection coating for metallic interconnect. Aiming at studying the oxidation kinetics of Fe-16Cr alloy, the LaCo0.6Ni0.4O3-δ (LCN) with different particle sizes are chosen as in-situ protective coating to investigate their heat resistant effect at 750 °C for up to 500 h. The oxidation rates of the coated alloy are approximately lowered to a quarter compared to that of the bare alloy. The oxidized specimens are characterized to obtain the morphology, thickness, composition and phase structure of the oxide scales. The area specific resistances contributed by the oxide scale are 0.101 Ω cm2 and 0.062 Ω cm2 for the bare and coated alloy, respectively, which is consistent with oxidation kinetic plots. Furthermore, a degradation test of 5-cell stack is conducted to evaluate the effect of in-situ protective coating on oxidation of Fe-16Cr alloy in real SOFC operation condition. The results reveal that the presence of the LCN layer can effectively improve the long term operation stability for SOFC stack.

中文翻译:

LaCo0.6Ni0.4O3-δ阴极接触层对作为固体氧化物燃料电池互连件的Fe-16Cr合金高温氧化的原位保护作用研究

摘要 阴极接触材料是平面固体氧化物燃料电池(SOFC)电堆的主要组成部分之一,其作用是维持稳定的电连接和形成金属互连的保护涂层。为了研究 Fe-16Cr 合金的氧化动力学,选择不同粒径的 LaCo0.6Ni0.4O3-δ (LCN) 作为原位保护涂层,研究其在 750 °C 下长达 500 h 的耐热效果. 与裸合金相比,涂层合金的氧化速率大约降低到四分之一。对氧化后的试样进行表征,以获得氧化皮的形态、厚度、成分和相结构。对于裸合金和涂层合金,氧化皮贡献的面积电阻率分别为 0.101 Ω cm2 和 0.062 Ω cm2,这与氧化动力学图一致。此外,还进行了 5 节电池组的退化测试,以评估原位保护涂层在真实 SOFC 操作条件下对 Fe-16Cr 合金氧化的影响。结果表明,LCN层的存在可以有效提高SOFC电堆的长期运行稳定性。
更新日期:2020-08-01
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