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Evaluation of layered perovskites YBa1−xSrxCo2O5+δ as cathodes for intermediate-temperature solid oxide fuel cells

hal.structure.identifierKey Laboratory of Functional Inorganic Material Chemistry [KLFIMC]
dc.contributor.authorMENG, Fuchang
hal.structure.identifierKey Laboratory of Functional Inorganic Material Chemistry [KLFIMC]
dc.contributor.authorXIA, Tian
hal.structure.identifierKey Laboratory of Superlight Materials and Surface Technology
dc.contributor.authorWANG, Jingping
hal.structure.identifierKey Laboratory of Functional Inorganic Material Chemistry [KLFIMC]
dc.contributor.authorSHI, Zhan
hal.structure.identifierKey Laboratory of Functional Inorganic Material Chemistry [KLFIMC]
dc.contributor.authorLIAN, Jie
hal.structure.identifierKey Laboratory of Functional Inorganic Material Chemistry [KLFIMC]
dc.contributor.authorZHAO, Hui
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBASSAT, Jean-Marc.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGRENIER, Jean-Claude
dc.date.issued2014
dc.identifier.issn0360-3199
dc.description.abstractEnThis study is focused on the structural characteristics, oxygen nonstoichiometry, electrical conductivity, electrochemical performance and oxygen reduction mechanism of YBa1−xSrxCo2O5+δ (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5). The high oxygen nonstoichiometry, δ = 0.18-0.43 at 700 °C, indicates the large oxygen vacancy concentrations in oxides. The electrical conductivity is improved due to the greater amount of electronic holes originated from the increased interstitial oxygen, and the conductivities of all samples are above 100 S cm−1 at 400-700 °C in air. The results demonstrate the promising performance of YBa1−xSrxCo2O5+δ cathodes at intermediate temperatures, as evidenced by low area-specific resistances (ASRs) e.g. 0.21-0.59 Ω cm2 at 700 °C. The lowest ASR, 0.44 Ω cm2, and the cathodic overpotential, −40 mV at a current density of −136 mA cm−2, are obtained in YBaCo2O5+δ cathode at 650 °C. The dependence of polarization resistance on oxygen partial pressure suggests that the charge transfer process is the rate-limiting step for oxygen reduction reaction in YBaCo2O5+δ cathode.
dc.language.isoen
dc.publisherElsevier
dc.title.enEvaluation of layered perovskites YBa1−xSrxCo2O5+δ as cathodes for intermediate-temperature solid oxide fuel cells
dc.typeArticle de revue
dc.identifier.doi10.1016/j.ijhydene.2014.01.008
dc.subject.halChimie/Matériaux
bordeaux.journalInternational Journal of Hydrogen Energy
bordeaux.page4531-4543
bordeaux.volume39
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-01044626
hal.version1
hal.popularnon
hal.audienceInternationale
dc.subject.esSolid oxide fuel cell (SOFC)
dc.subject.esCathode material
dc.subject.esLayered perovskite
dc.subject.esElectrochemical performance
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01044626v1
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