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合金连接体中挥发出来的气态Cr6+是造成固体氧化物燃料电池(SOFC)性能衰减的重要原因之一。目前对Cr毒化SOFC阴极的机理尚未形成统一认识,电化学反应模型认为Cr参与了阴极的电化学氧还原反应过程,并沉积在三相反应界面处;化学反应模型认为,Cr沉积是由形核反应驱动的,电极内的形核剂是Cr沉积的决定因素。本文综述了近十年来Cr毒化SOFC阴极方面的研究进展,尤其是Cr对阴极和电解质的电子和氧离子传输性质的作用。
The gaseous Cr6 + volatilized from the alloy interconnects is one of the important reasons for the degradation of the performance of the solid oxide fuel cell (SOFC). Currently, there is no unified understanding of the mechanism of Cr poisoning SOFC cathodes. The electrochemical reaction model considers that Cr participates in the cathodic electrochemical oxygen reduction reaction process and is deposited at the interface of three-phase reaction. The chemical reaction model suggests that Cr deposition is caused by the nucleation reaction The driven, nucleating agent within the electrode is a determinant of Cr deposition. This review summarizes recent progress in Cr-poisoned SOFC cathodes, especially the effect of Cr on the electron and oxygen ion transport properties of cathodes and electrolytes.