High-performance SrNb0.1Co0.9-xFexO 3-δ perovskite cathodes for low-temperature solid oxide fuel cells

Zhu, Yinlong, Sunarso, Jaka, Zhou, Wei, Jiang, Shanshan and Shao, Zongping (2014) High-performance SrNb0.1Co0.9-xFexO 3-δ perovskite cathodes for low-temperature solid oxide fuel cells. Journal of Materials Chemistry A, 2 37: 15454-15462. doi:10.1039/c4ta03208j


Author Zhu, Yinlong
Sunarso, Jaka
Zhou, Wei
Jiang, Shanshan
Shao, Zongping
Title High-performance SrNb0.1Co0.9-xFexO 3-δ perovskite cathodes for low-temperature solid oxide fuel cells
Formatted title
High-performance SrNb0.1Co0.9-xFexO3-δ perovskite cathodes for low-temperature solid oxide fuel cells
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7496
2050-7488
Publication date 2014-10
Sub-type Article (original research)
DOI 10.1039/c4ta03208j
Open Access Status Not Open Access
Volume 2
Issue 37
Start page 15454
End page 15462
Total pages 9
Place of publication Cambridge United Kingdom
Publisher Royal Society of Chemistry
Collection year 2015
Language eng
Subject 1600 Chemistry
2105 Renewable Energy, Sustainability and the Environment
2500 Materials Science
Formatted abstract
Chemical to electrical energy conversion using a solid oxide fuel cell (SOFC) becomes more practical as the operating temperature is lowered to 600 °C and below. Given the thermally activated nature of the oxygen reduction reaction (ORR) at the cathode side, development of cathode catalysts with very low polarisation resistance is essential. Here, we showed that partial substitution of Co within SrNb0.1Co0.9O3-δ by Fe (up to 0.5) triggers the formation of oxygen non-stoichiometry while preserving the primitive cubic lattice, thus substantially enhancing the ORR performance below 600 °C (relative to the parent compound). Close correlation between the oxygen non-stoichiometry and ORR activity trends was found to some extent. SrNb0.1Co 0.7Fe0.2O3-δ (SNCF0.2) cathode exhibits a very low area specific resistance value of 0.052 Ω cm2 at 600 °C which translates to superior fuel cell performance, e.g. peak power density of 1587 mW cm-2 at 600 °C. Moreover, the synergistic relationship between ORR activity, thermal expansion coefficient and enhanced CO2 resistance attests to the significance of the SNCF cathode. The last attribute is envisioned as a dominant factor for applications using alternative fuels (e.g. CO which normally contains CO2) and in a portable single-chamber SOFC.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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