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题名: Remarkable dependence of electrochemical performance of SrCo0.8Fe0.2O3-delta on A-site nonstoichiometry
作者: Liu, Huanying1, 2;  Zhu, Xuefeng1;  Cong, You1;  Zhang, Tianyu1;  Yang, Weishen1
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2012
DOI: 10.1039/c2cp41060e
卷: 14, 期:20, 页:7234-7239
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: SrCo0.8Fe0.2O3-delta is a controversial material whether it is used as an oxygen permeable membrane or as a cathode of solid oxide fuel cells. In this paper, carefully synthesized powders of perovskite-type SrxCo0.8Fe0.2O3-delta (x = 0.80-1.20) oxides are utilized to investigate the effect of A-site nonstoichiometry on their electrochemical performance. The electrical conductivity, sintering property and stability in ambient air of SrxCo0.8Fe0.2O3-delta are critically dependent on the A-site nonstoichiometry. Sr1.00Co0.8Fe0.2O3-delta has a single-phase cubic perovskite structure, but a cobalt-iron oxide impurity appears in A-site cation deficient samples and Sr-3(Co, Fe)(2)O7-delta appears when there is an A-site cation excess. It was found that the presence of the cobalt-iron oxide improves the electrochemical performance. However, Sr-3(Co, Fe)(2)O7-delta has a significant negative influence on the electrochemical activity for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The peak power densities with a single-layer Sr1.00Co0.8Fe0.2O3-delta cathode are 275, 475, 749 and 962 mW cm(-2) at 550, 600, 650 and 700 degrees C, respectively, values which are slightly lower than those for Sr0.95Co0.8Fe0.2O3-delta (e.g. 1025 mW cm(-2) at 700 degrees C) but much higher than those for Sr1.05Co0.8Fe0.2O3-delta (e.g. only 371 mW cm(-2) at 700 degrees C). This remarkable dependence of electrochemical performance of the SrxCo0.8Fe0.2O3-delta cathode on the A-site nonstoichiometry reveals that lower values of electrochemical activity reported in the literature may be induced by an A-site cation excess. Therefore, to obtain a high performance of SrxCo0.8Fe0.2O3-delta cathode for IT-SOFCs, an A-site cation excess must be avoided.
关键词[WOS]: OXIDE FUEL-CELLS ;  INTERMEDIATE TEMPERATURE SOFCS ;  ANODE MATERIALS ;  COMPOSITE CATHODES ;  OXYGEN PERMEATION ;  ELECTRICAL-CONDUCTIVITY ;  POWER-DENSITY ;  IT-SOFC ;  PEROVSKITES ;  ELECTROLYTE
语种: 英语
WOS记录号: WOS:000303444000006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138096
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, State Key Lab Catalysis, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Huanying,Zhu, Xuefeng,Cong, You,et al. Remarkable dependence of electrochemical performance of SrCo0.8Fe0.2O3-delta on A-site nonstoichiometry[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2012,14(20):7234-7239.
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