Evaluation and optimization of Bi1−xSrxFeO3−δ perovskites as cathodes of solid oxide fuel cells

Niu, Yingjie and Sunarso, Jaka and Zhou, Wei and Liang, Fengli and Ge, Lei and Zhu, Zhonghua and Shao, Zongping (2011) Evaluation and optimization of Bi1−xSrxFeO3−δ perovskites as cathodes of solid oxide fuel cells. International Journal of Hydrogen Energy, 36 (4). pp. 3179-3186. ISSN 0360-3199

Abstract

Lattice expansion behaviour, oxygen nonstoichiometry, mean iron oxidation state, electrical conductivity and interfacial polarization resistance of Bi1-xSrxFeO3-δ were reported as a function of Sr-doping content for x = 0.3, 0.5 and 0.8. Among the series, Bi0.5Sr0.5FeO3-δ (BSF5) demonstrates the optimum performance in terms of the lowest interfacial polarization resistance and the largest oxygen nonstoichiometry. It is demonstrated that the best microstructure and the lowest interfacial resistance can be obtained by firing BSF5 onto dense Sm0.2Ce0.8O1.9 (SDC) electrolyte at 1000°C. BSF5 exhibits good chemical compatibility with SDC; however, firing temperature above 1000 °C results in the formation of bismuth-deficient perovskite with inferior activity for oxygen reduction reaction. We also show that single-phase BSF5 cathode provides better electrode performance than its composite with SDC. This is due to the increased charge-transfer resistance upon adding SDC which have negligible electronic conductivity.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 30 May 2017 01:37
Last Modified: 07 Jun 2017 00:23
Uncontrolled Keywords: charge transfer resistance; chemical compatibility; electrical conductivity; electrode performance; electronic conductivity; firing temperature; interfacial polarization resistance; interfacial resistances; iron oxidation state; lattice expansion; optimum performance; oxygen non-stoichiometry; oxygen reduction reaction; Sr-doping content; cerium; charge transfer; electric conductivity; electrolytic reduction; gas fuel purification; iron oxides; oxygen; perovskite; polarization; solid oxide fuel cells (SOFC); bismuth
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091201 Ceramics
Identification Number or DOI: 10.1016/j.ijhydene.2010.11.109
URI: http://eprints.usq.edu.au/id/eprint/31158

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