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Identification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFLURA, Aurélien
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorNICOLLET, Clément
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFOURCADE, Sébastien
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorVIBHU, Vaibhav
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROUGIER, Aline
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.issued2015
dc.identifier.issn0013-4686
dc.description.abstractEnAn in-depth analysis of the very low frequency impedance arcs observed when measuring efficient solid oxide fuel cell electrodes by electrochemical impedance spectroscopy (EIS) is reported in this paper. The study was carried out on Pr2NiO4+δ//Ce0.8Gd0.2O2- δ//3 mol.% Y2O3-ZrO2 symmetrical half-cell. In the temperature range 500–900 °C, three impedance arcs related to O2 molecular diffusion were distinguished from the EIS measurements. Based on theoretical calculations using the Adler-Lane-Steele (ALS) and Dusty gas models, the arc at highest frequencies was ascribed to the diffusion of O2 in the porous structures of the electrode and collecting gold grid. It obeys the ALS model, i.e. a parallel R//C impedance with a capacitance coming mainly from the solid phase. The second arc at medium frequencies was ascribed to the diffusion of O2 in the porous structure of the ceramic part used to maintain the gold grid. It follows the Dusty gas model, i.e. a Warburg impedance with relaxation time depending on the gas phase properties. Finally, the third one at lowest frequencies was ascribed to the “gas conversion” phenomenon, coming from a difference in the local pO2 above the active sites of the working and counter electrodes. This gas conversion impedance largely increases when clogging the channels of the gas distribution system.
dc.language.isoen
dc.publisherElsevier
dc.title.enIdentification and modelling of the oxygen gas diffusion impedance in SOFC porous electrodes: application to Pr2NiO4+δ
dc.typeArticle de revue
dc.identifier.doi10.1016/j.electacta.2015.06.084
dc.subject.halChimie/Matériaux
dc.description.sponsorshipEuropeRobust Advanced Materials for metal Supported SOFC
bordeaux.journalElectrochimica Acta
bordeaux.page1030-1040
bordeaux.volume174
bordeaux.peerReviewedoui
hal.identifierhal-01235397
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01235397v1
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