A comparative study of SrCo0.8Nb0.2O3-δ and SrCo0.8Ta0.2O3-δ as low-temperature solid oxide fuel cell cathodes: effect of non-geometry factors on the oxygen reduction reaction

Li, Mengran, Zhou, Wei, Peterson, Vanessa K., Zhao, Mingwen and Zhu, Zhonghua (2015) A comparative study of SrCo0.8Nb0.2O3-δ and SrCo0.8Ta0.2O3-δ as low-temperature solid oxide fuel cell cathodes: effect of non-geometry factors on the oxygen reduction reaction. Journal of Materials Chemistry A, 3 47: 24064-24070. doi:10.1039/c5ta07178j


Author Li, Mengran
Zhou, Wei
Peterson, Vanessa K.
Zhao, Mingwen
Zhu, Zhonghua
Title A comparative study of SrCo0.8Nb0.2O3-δ and SrCo0.8Ta0.2O3-δ as low-temperature solid oxide fuel cell cathodes: effect of non-geometry factors on the oxygen reduction reaction
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7496
2050-7488
Publication date 2015-01-01
Sub-type Article (original research)
DOI 10.1039/c5ta07178j
Open Access Status Not Open Access
Volume 3
Issue 47
Start page 24064
End page 24070
Total pages 7
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
The oxygen reduction reaction (ORR) activity of cathodes has to be improved to realize the low-temperature operation of solid-oxide fuel cells (SOFCs). Whilst geometric factors are conventionally accepted to influence the ORR activity of perovskite cathodes, other factors may also contribute and therefore need to be explored. Here, we substituted 20% niobium and tantalum which have similar ionic radii into strontium cobaltites to obtain the two perovskite oxides SrCo0.8Nb0.2O3−δ (SCN20) and SrCo0.8Ta0.2O3−δ (SCT20), respectively. Our study of the isostructural SCN20 and SCT20 allows geometric effects to be separated from other factors, and we observe better cathode performance of SCT20 cathode, which may be related to the lower electronegativity of Ta5+, thus resulting in higher oxygen surface exchange kinetics and diffusivity as compared with Nb5+.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
 
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