Novel layered perovskite SmBaCu₂O_5+¦Ä as a potential cathode for intermediate temperature solid oxide fuel cells

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• 作者：Xin  ; Kong ; Xifeng  ; Ding  ; ;   ; ^{dingxifeng2002@163.com}
• 关键词：SOFC ; Cathodes ; Layered perovskite ; Thermal expansion ; Electrochemical impedance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：36
• 期：24
• 页码：15715-15721
• 全文大小：543 K

文摘

A novel layered perovskite SmBaCu₂O_5+¦Ä (SBCO) as a potential cathode for intermediate temperature solid oxide fuel cells (IT-SOFC) has been investigated in this paper. The SmBaCu₂O_5+¦Ä oxide was synthesized by EDTA- Citrate complexing sol-gel process. The crystal structure, the thermal expansion, the electrical conductivity and electrochemical properties have been characterized by X-ray diffraction (XRD), dilatometer, four-probe dc method, electrochemical impedance spectroscopy (EIS) and cathodic polarization examinations. The average thermal expansion coefficient (TEC) of SBCO was 14.6?¡Á?10^?/?¡ãC in the temperature range of 50?00?¡ãC, which matched Sm-doped ceria (SDC) electrolytes. The electrode polarization resistance was 0.469?¦¸cm². Considering low thermal expansions and good electrochemical properties, layered perovskite SBCO shows promising performance as cathode material for IT-SOFCs.