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Oxygen reduction on porous Ln2NiO4+δ electrodes.

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMAUVY, Fabrice
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLALANNE, Cécile
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
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierCollege of Chemistry and Chemical Technology
dc.contributor.authorZHAO, H.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDORDOR, Patrice
hal.structure.identifierEuropean Institute For Energy Research [EIFER]
dc.contributor.authorSTEVENS, Philippe
dc.date.issued2005
dc.identifier.issn0955-2219
dc.description.abstractEnLn2NiO4+δ based materials (Ln = La, Nd or Pr), show very good electrocatalytic performances as SOFC cathode: the oxygen diffusion coefficient D* and the surface exchange coefficient k measured by isotopic exchange are several orders of magnitude higher than that of the standard LSM cathode material. They are good mixed ionic and electronic conductors (MIEC) due to the mixed valence of the transition metal cation M and to the presence of mobile additional oxygen atoms. Therefore, the O2 reduction is not limited by a charge transfer process occurring usually at the one-dimensional “three-phase boundary” interface between gas, electrode and electrolyte characteristic of metallic cathodes. This study aims to characterise the reaction kinetics at O2(g), Ln2NiO4+δ/zirconia porous electrodes in the temperature range 500–800 °C, under air. In order to identify interfaces and electrode processes, ac electrochemical impedance spectroscopy was used under zero bias conditions with symmetrical cells. Using the Schouler method, the electrode/electrolyte interface impedance has been clearly identified as the limiting step. Furthermore, electrode properties have also been measured under non-zero dc conditions with a three-electrode cell. The polarisation curves allow to confirm that Ln2NiO4+δ oxides are promising materials for SOFC cathode. The observed overpotentials are lower than those observed for LSM under the same current and temperature conditions. Nevertheless, the interface between Ln2NiO4+δ and zirconia should be optimised by a better shaping because the interfacial resistance appears to be the most important contribution to the total impedance.
dc.language.isoen
dc.publisherElsevier
dc.subject.enElectrical conductivity
dc.subject.enImpedance
dc.subject.enIonic conductivity
dc.subject.enTransition metal oxides
dc.subject.enFuel cells
dc.title.enOxygen reduction on porous Ln2NiO4+δ electrodes.
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jeurceramsoc.2005.03.120
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the European Ceramic Society
bordeaux.pagep. 2669-2672
bordeaux.volumevol. 25, n° 12
bordeaux.peerReviewedoui
hal.identifierhal-00019433
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00019433v1
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