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Long-range oxygen ordering linked to topotactic oxygen release in Pr2NiO4+δ fuel cell cathode material

hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorDUTTA, Rajesh
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorMAITY, Avishek
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorMARSICANO, Anna
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorCERETTI, Monica
hal.structure.identifierEuropean Synchrotron Radiation Facility [ESRF]
dc.contributor.authorCHERNYSHOV, Dmitry
hal.structure.identifierEuropean Synchrotron Radiation Facility [ESRF]
dc.contributor.authorBOSAK, Alexei
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorVILLESUZANNE, Antoine
hal.structure.identifierInstitute of Crystallography [Aachen]
dc.contributor.authorROTH, Georg
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorPERVERSI, Giuditta
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
dc.contributor.authorPAULUS, Werner
dc.date.issued2020
dc.identifier.issn2050-7488
dc.description.abstractEnSolid oxide ion conductors are technologically important for oxygen membranes, sensors and solid oxide fuel cells (SOFC). However, oxygen diffusion is a thermally activated process, and materials operating at ambient temperature are rare, as the related diffusion mechanisms are poorly understood. Herein, we report a hidden spontaneous oxygen release reaction that interconverts two stoichiometric phases of the SOFC material Pr2NiO4+δ with unprecedented structural complexity at ambient temperature. A slight change in the oxygen stoichiometry from δ = 0.25 to δ = 0.225 involves a transition between two competing modulated superstructures, showing long-range translational periodicities up to 94 Å. Our findings demonstrate correlated oxygen diffusion within the bulk phase at room temperature, which is accompanied by the formation of long-range modulated superstructures up to the lower mesoscale. Large-scale ordered structures found here for Pr2NiO4+δ are rather indicative of non-local interactions, and are interpreted to be mediated via structural deformations. This unexpected behavior is discussed in terms of an unconventional understanding of low-T oxygen diffusion mechanisms and its potential to conceive and optimize oxygen ion conductors, which are an important class of compounds relevant to technological applications.
dc.description.sponsorshipMécanismes assistés pour la conduction par ion oxygène dans des oxydes non stœchiométriques
dc.description.sponsorshipStructural induced Electronic Complexity controlled by low temperature Topotactic Reaction
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enLong-range oxygen ordering linked to topotactic oxygen release in Pr2NiO4+δ fuel cell cathode material
dc.typeArticle de revue
dc.identifier.doi10.1039/D0TA04652C
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry A
bordeaux.page13987-13995
bordeaux.volume8
bordeaux.issue28
bordeaux.peerReviewedoui
hal.identifierhal-02895150
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02895150v1
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