Performance degradation of SmBaCo2O5+? cathode induced by chromium deposition for solid oxide fuel cells
By Bo Wei and Kongfa Chen and Cheng Cheng Wang and Zhe L
Published in Electrochimica Acta
2015
Abstract
Chromium deposition and poisoning at double-perovskite type SmBaCo2O5+? (SBCO) cathodes of solid oxide fuel cells (SOFCs) are studied. The electrochemical activity of \SBCO\ cathodes for the \O2\ reduction reaction degrades quickly in the presence of a chromia-forming metallic interconnect, indicating that \SBCO\ is not a Cr-tolerant and resistance cathode. The results indicate that the deposition of Cr species is essentially induced by the segregated BaO on the \SBCO\ surface, leading to the formation of BaCrO4. The deposition and formation of BaCrO4 phase accelerates the abstraction of Ba from the SBCO, resulting to the decomposition of \SBCO\ double perovskite structure and the loss of electrochemical activity for the \O2\ reduction reaction.