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题名: Scandium-doped PrBaCo2-xScxO6-delta oxides as cathode material for intermediate-temperature solid oxide fuel cells
作者: Li, Xiangnan1;  Jiang, Xuening1;  Xu, Hongxia1;  Xu, Qiuli1;  Jiang, Lei2;  Shi, Yuchao1;  Zhang, Qingyu1
关键词: Cathode ;  Sc3+ doping ;  Oxygen content ;  Structure ;  Thermal expansion ;  Performance
刊名: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
发表日期: 2013-09-10
DOI: 10.1016/j.ijhydene.2013.07.024
卷: 38, 期:27, 页:12035-12042
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Energy & Fuels
英文摘要: Scandium-doped PrBaCo2-xScxO6-delta(PBCS-x, x = 0.00-1.00) oxides have been evaluated as cathode materials of intermediate-temperature solid oxide fuel cells (IT-SOFCs) with respect to phase structure, oxygen content, thermal expansion behavior and electrical and electrochemical properties. The XRD results have demonstrated a phase transition in PBCS-x due to Sc3+ doping from tetragonal double-layered perovskite structure at x = 0.00 -0.20, bi-phase mixtures at x = 0.30-0.40, to cubic perovskite structure at x = 0.50-0.90. The oxygen contents (6-delta) and average valences of cobalt ions in PBCS-x decrease with the higher Sc3+ content and increasing temperatures in air. Sc3+ doping has also led to decreased thermal expansion coefficients, lowered electrical conductivities and enhanced electrochemical reaction activities for PBCS-x characterized by decreased area-specific resistances (ASRs) and smaller reaction activation energies. Among the studied samples, the PBCS-0.50 oxide with Sc3+-doping content of x = 0.50 exhibits the best electrochemical performance on Ce0.9Gd0.1O1.95 electrolyte. Its ASR values range from 0.123 Omega cm(2) at 600 degrees C to 0.022 Omega cm(2) at 750 degrees C, which are much lower than the related cathode materials. These results have demonstrated that the PBCS-0.50 oxide is a promising cathode material for IT-SOFCs. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: LNBACO(2)O(5+DELTA) ;  DIFFUSION ;  STABILITY ;  ION
语种: 英语
WOS记录号: WOS:000324563200041
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137652
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.Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem & Phys, Dalian 116023, Peoples R China

Recommended Citation:
Li, Xiangnan,Jiang, Xuening,Xu, Hongxia,et al. Scandium-doped PrBaCo2-xScxO6-delta oxides as cathode material for intermediate-temperature solid oxide fuel cells[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2013,38(27):12035-12042.
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