Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-sNb0.1Co0.9O3-δ perovskite cathodes

被引：37

作者：

Zhu, Yinlong ^{[1
]}

Lin, Ye ^{[2
]}

Shen, Xuan ^{[3
,4
]}

Sunarso, Jaka ^{[5
]}

Zhou, Wei ^{[6
]}

Jiang, Shanshan ^{[1
]}

Su, Dong ^{[3
]}

Chen, Fanglin ^{[2
]}

Shao, Zongping ^{[7
]}

机构：

[1] Nanjing Tech Univ, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Jiangsu, Peoples R China

[2] Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA

[3] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

[4] Nanjing Univ, Dept Mat Sci & Engn, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[5] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[6] Univ Queensland, Sch Chem Engn, Brisbane, Qld 4072, Australia

[7] Nanjing Tech Univ, Coll Energy, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Jiangsu, Peoples R China

来源：

RSC ADVANCES | 2014年 / 4卷 / 77期

基金：

澳大利亚研究理事会;

关键词：

OXIDE FUEL-CELL; STABILITY; CONDUCTIVITY; TRANSITION; SOFC;

D O I：

10.1039/c4ra06191h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The creation of A-site cation defects within a perovskite oxide can substantially alter the structure and properties of its stoichiometric analogue. In this work, we demonstrate that by vacating 2 and 5% of A-site cations from SrNb0.1Co0.9O3-delta (SNC1.00) perovskites (Sr1-sNb0.1Co0.9O3-delta, s = 0.02 and 0.05; denoted as SNC0.98 and SNC0.95, respectively), a Jahn-Teller (JT) distortion with varying extents takes place, leading to the formation of a modified crystal lattice within a the perovskite framework. Electrical conductivity, electrochemical performance, chemical compatibility and microstructure of Sr1-sNb0.1Co0.9O3-delta as cathodes for solid oxide fuel cells were evaluated. Among SNC1.00, SNC0.98 and SNC0.95, SNC0.95 (P4/mmm symmetry (#123)) which exhibits a large JT distortion in conjunction with charge-ordering of cobalt (Co) shows the best oxygen reduction reaction (ORR) activity at low temperature while SNC0.98 (P4mm symmetry (#99)), which displays a local JT distortion, shows the poorest performance.

引用

页码：40865 / 40872

页数：8

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