Synergistic thermal expansion reduction in cobalt-containing perovskite cathodes for solid oxide fuel cells

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dc.contributor.authorShah, N.
dc.contributor.authorZhu, T.
dc.contributor.authorXu, X.
dc.contributor.authorWang, H.
dc.contributor.authorZhu, Z.
dc.contributor.authorGe, L.
dc.date.issued2025
dc.description.abstractSrCoO(3)(-)(δ) -based cathodes, such as Ba(0)(.)(5)Sr(0)(.)(5)Co(0)(.)(8)Fe(0)(.)(2)O(3)(-)(δ) (BSCF), exhibit high oxygen reduction reaction (ORR) activity, making them strong candidates for solid oxide fuel cells (SOFCs). However, their high thermal expansion leads to significant mechanical degradation during thermal cycling, hindering their broader application. In this study, we introduced a synergistic strategy by incorporating negative thermal expansion material Sc(2)W(3)O(1)(2) (ScWO) into BSCF to reduce the overall thermal expansion of composite cathode. The thermal expansion offset strategy together with the suppression of cobalt reduction at the elevated temperature, contributes for maintaining thermal compatibility in cobalt-based cathode and the cathode/electrolyte interface. Over 40 thermal cycles between 600 and 300ºC, BSCF showed more than 100 % ASR degradation, while the composite cathode demonstrated just 18 % degradation, indicating enhanced thermal cycling resistance. Microstructural analysis using FIB-SEM revealed approximately 140 % relative porosity increase in BSCF due to microcracking. In contrast, negligible porosity change was observed in the composite cathode, confirming the benefit to the overall structural integrity.
dc.description.statementofresponsibilityNilam Shah, Tianjiu Zhu, Xiaoyong Xu, Hao Wang, Zhonghua Zhu, Lei Ge
dc.identifier.citationJournal of Power Sources, 2025; 654:237832-1-237832-12
dc.identifier.doi10.1016/j.jpowsour.2025.237832
dc.identifier.issn0378-7753
dc.identifier.issn1873-2755
dc.identifier.orcidXu, X. [0000-0002-0149-815X]
dc.identifier.urihttps://hdl.handle.net/2440/147690
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101397
dc.relation.granthttp://purl.org/au-research/grants/arc/DP250102334
dc.relation.granthttp://purl.org/au-research/grants/arc/FT220100166
dc.rights© 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.source.urihttps://doi.org/10.1016/j.jpowsour.2025.237832
dc.subjectsynergistic thermal expansion reduction; solid oxide fuel cells
dc.titleSynergistic thermal expansion reduction in cobalt-containing perovskite cathodes for solid oxide fuel cells
dc.typeJournal article
pubs.publication-statusPublished

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