A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-δ perovskite cathodes

Niu, YJ, Sunarso, J, Liang, FL, Zhou, W, Zhu, ZH and Shao, ZP (2011) A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-δ perovskite cathodes. Journal of the Electrochemical Society, 158 2: B132-B138. doi:10.1149/1.3521316


Author Niu, YJ
Sunarso, J
Liang, FL
Zhou, W
Zhu, ZH
Shao, ZP
Title A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-δ perovskite cathodes
Formatted title A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-δ perovskite cathodes
Journal name Journal of the Electrochemical Society   Check publisher's open access policy
ISSN 0013-4651
1945-7111
Publication date 2011
Year available 2010
Sub-type Article (original research)
DOI 10.1149/1.3521316
Volume 158
Issue 2
Start page B132
End page B138
Total pages 7
Place of publication Pennington, NJ, United States
Publisher Electrochemical Society
Collection year 2011
Language eng
Formatted abstract In this work the oxygen reduction reaction on Bi0.5 Sr 0.5 FeO3-δ (BSF) and La0.5 Sr 0.5 Fe O3-δ (LSF) as cathodes for intermediate temperature solid oxide fuel cells (600-750°C) is compared in detail. Partial substitution of Sr in SrFe O3-δ with 50 mole % of Bi or La results in the distinct structural features which strongly impact its electrochemical characteristics due to the presence of a lone electron pair in Bi3+, which is not available in La3+. Cubic structure for BSF favours higher ionic conductivity and enhanced formation of oxygen vacancies relative to rhombohedral structure for LSF. Large oxygen nonstoichiometry for BSF, nevertheless, leads to the dominance of Fe3+ and subsequent low electronic conductivity relative to LSF. It was found that upon cathodic polarization, the oxygen vacancies are created on LSF which helps reducing its interfacial resistance afterward, which is not the case for BSF. Overall, BSF demonstrates good electrochemical performance which can be further optimized by enhancing its electronic conductivity.
© 2010 The Electrochemical Society.
Keyword Oxide fuel-cells
Impedance spectroscopy
Transport-properties
Lanthanum-ferrite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published December 3, 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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