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Journal article
Long-range oxygen ordering linked to topotactic oxygen release in Pr(2)NiO(4+delta)fuel cell cathode material
Journal of materials chemistry. A, Materials for energy and sustainability, v 8(28), pp 13987-13995
28 Jul 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Solid 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 Pr(2)NiO(4+delta)with unprecedented structural complexity at ambient temperature. A slight change in the oxygen stoichiometry from delta= 0.25 to delta= 0.225 involves a transition between two competing modulated superstructures, showing long-range translational periodicities up to 94 angstrom. 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 Pr(2)NiO(4+delta)are rather indicative of non-local interactions, and are interpreted to be mediatedviastructural deformations. This unexpected behavior is discussed in terms of an unconventional understanding of low-Toxygen diffusion mechanisms and its potential to conceive and optimize oxygen ion conductors, which are an important class of compounds relevant to technological applications.
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Details
- Title
- Long-range oxygen ordering linked to topotactic oxygen release in Pr(2)NiO(4+delta)fuel cell cathode material
- Creators
- Rajesh Dutta - Institut Charles Gerhardt MontpellierAvishek Maity - Institut Charles Gerhardt MontpellierAnna Marsicano - Institut Charles Gerhardt MontpellierMonica Ceretti - Institut Charles Gerhardt MontpellierDmitry Chernyshov - European Synchrotron Radiation FacilityAlexei Bosak - European Synchrotron Radiation FacilityAntoine Villesuzanne - Institut de Chimie de la Matière Condensée de BordeauxGeorg Roth - RWTH Aachen UniversityGiuditta Perversi - Institut Charles Gerhardt MontpellierWerner Paulus - Institut Charles Gerhardt Montpellier
- Publication Details
- Journal of materials chemistry. A, Materials for energy and sustainability, v 8(28), pp 13987-13995
- Publisher
- Royal Soc Chemistry
- Number of pages
- 9
- Grant note
- ANR-14-CE36-0006-01 / French National Research Agency (ANR) through the project "Structural induced Electronic Complexity controlled by low temperature Topotactic Reaction" (SECTOR); French National Research Agency (ANR) ANR-14-CE05-0016-02 / French National Research Agency (ANR) through the project "Assisted Mechanisms for Oxygen Ionic conduction in non-Stoichiometric oxides" (AMOXIS); French National Research Agency (ANR)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000551538000009
- Scopus ID
- 2-s2.0-85088700705
- Other Identifier
- 991022004621204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary