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

Yinlong Zhu, Ye Lin, Xuan Shen, Jaka Sunarso, Wei Zhou, Shanshan Jiang, Dong Su, Fanglin Chen, Zongping Shao

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30 Citations (Scopus)

Abstract

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-δ(SNC1.00) perovskites (Sr1-sNb0.1Co0.9O3-δ, 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-δas 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. This journal is

Original languageEnglish
Pages (from-to)40865-40872
Number of pages8
JournalRSC Advances
Volume4
Issue number77
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes

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