SmBa_0.5Sr_0.5Cu₂O_5+¦Ä and SmBa_0.5Sr_0.5CuFeO_5+¦Ä layered perovskite oxides as cathodes for IT-SOFCs

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• 作者：Xifeng Ding ; ^{dingxifeng2002@163.com} ; Xin Kong ; Haina Wu ; Yihua Zhu ; Jianming Tang ; Yujie Zhong
• 关键词：SOFC ; Cathodes ; Layered perovskite ; Electrochemical performance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：37
• 期：3
• 页码：2546-2551
• 全文大小：883 K

文摘

Novel Cobalt-free layered perovskite oxides SmBa_0.5Sr_0.5Cu₂O_5+¦Ä (SBSCO) and SmBa_0.5Sr_0.5CuFeO_5+¦Ä (SBSCFO) were investigated as cathode materials for intermediate-temperature solid fuel cells (IT-SOFCs). The thermal expansion coefficients (TEC) of SBSCO and SBSCFO were 14.1?¡Á?10^?/¡ãC and 14.9?¡Á?10^?/¡ãC in 50?¡ãC-800?¡ãC, which were more compatible with electrolyte than cobalt-based cathodes. When A?site is partially substituted by Sr, the conductivity of SBSCO and SBSCFO had been improved. The max electrical conductivity of SBSCO was 277.7?S?cm^?, about one order of magnitude higher than SmBaCu₂O_5+¦Ä. Polarization resistance of SBSCO is 0.25?¦¸?cm² at 650?¡ãC, which is twice lower than that of SmBaCu₂O_5+¦Ä (SBCO). This implies SBSCO has higher activity for oxygen reduction than SBCO. Preliminary results indicate that SBSCO are promising as cathodes for IT-SOFCs.