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hal.structure.identifierFaculté des Sciences Exactes et Informatique Département de Chimie
hal.structure.identifierLaboratoire d’Etude sur les Interactions Matériaux-Environnement
dc.contributor.authorAMIRA, Sabah
hal.structure.identifierFaculté des Sciences Exactes et Informatique Département de Chimie
hal.structure.identifierLaboratoire d’Etude sur les Interactions Matériaux-Environnement
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFERKHI, Mosbah
hal.structure.identifierLaboratoire d’Etude sur les Interactions Matériaux-Environnement
dc.contributor.authorKHALED, Ammar
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.authorGRENIER, Jean-Claude
hal.structure.identifierCentre de Recherche en Physique de la Matière et du Rayonnement [Namur] [PMR]
dc.contributor.authorHOUSSIAU, Laurent
hal.structure.identifierCentre de Recherche en Physique de la Matière et du Rayonnement [Namur] [PMR]
dc.contributor.authorPIREAUX, Jean-Jacques
dc.date.issued2019-08
dc.identifier.issn0947-7047
dc.description.abstractEnThe kinetics and mechanism of oxygen reduction reaction (ORR) in alkaline medium are studied on lanthanum nickelate materials La2−x−yNdxPryNiO4±δ (x = 0, 0.3 and 0.5; y = 0 and 0.2) using the electrochemical technique of the rotating disk electrode in a 0.5-M solution of NaOH. The oxide powders are synthesized by the citrate–nitrate method. Structural and surface characterizations are performed by X-ray diffraction (XRD) and X-ray photoelectron spectrometry (XPS), while the morphology is studied by scanning electron microscopy (SEM). Electrochemical studies are carried out by linear voltamperometry, cyclic voltamperometry, and impedance spectroscopy. The doped and undoped electrocatalyst composites (La2−x−yNdxPryNiO4±δ/C), made of the rare earth nickel oxides mixed with carbon black (Vulcan XC-72(C)), are deposited as a thin layer on a glassy carbon substrate. At room temperature, the undoped electrocatalyst La2NiO4±δ material shows single-step kinetics unlike the doped materials. The doping by the rare earths Nd or/and Pr significantly enhances the electrical conductivity of the electrode under air and the diffusion of oxygen. On the other hand, the steric hindrance between the atomic oxygen orbital (π-orbital (O2)–π-orbital (O2)) and the dz2–orbital (Ni)–π-orbital (O2) influences the training model of the liaison (dz2(Ni)–π (O2)). The structure, oxygen adsorption, and oxidation states of the catalyst elements have a large influence on the mechanism and kinetics of the ORR. The LNNO3/C and LNPNO5/C electrocatalysts have better electrocatalytic performances, which allow them to be used as a bifunctional electrocatalyst for the reduction of oxygen in alkaline media.
dc.language.isoen
dc.publisherSpringer Verlag
dc.subject.enORR mechanism
dc.subject.enMIEC
dc.subject.enImpedance spectroscopy
dc.subject.enXPS analysis
dc.subject.enElectrocatalyst materials
dc.title.enCarbon-based lanthanum nickelate material La2−x−yNdxPryNiO4+δ (x = 0, 0.3, and 0.5; y = 0 and 0.2) as a bifunctional electrocatalyst for oxygen reduction in alkaline media
dc.typeArticle de revue
dc.identifier.doi10.1007/s11581-019-02963-0
dc.subject.halChimie/Matériaux
bordeaux.journalIonics
bordeaux.page3809-3822
bordeaux.volume25
bordeaux.issue8
bordeaux.peerReviewedoui
hal.identifierhal-02268573
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02268573v1
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