Redox behavior of the SOFC electrode candidate NdBaMn2O5+: δ investigated by high-temperature in situ neutron diffraction: First characterisation in real time of an Ln BaMn2O5.5 intermediate phase
| Autor: | Ronald I. Smith, Mona Bahout, Serge Paofai, Gilles H. Gauthier, Vincent Dorcet, Florent Tonus, Stephen J. Skinner |
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| Přispěvatelé: | Imperial College London, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Universidad Industrial de Santander [Bucaramanga] (UIS), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Digital storage Characterization Neutron diffraction Analytical chemistry Structural phase transition chemistry.chemical_element High-temperature in situ 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Oxygen Thermal expansion Atmospheric temperature Tetragonal crystal system Hydrogen storage Mixed ionic and electronic conductors Phase (matter) General Materials Science Real time observation Oxygen vacancy orderings Solid oxide fuel cells (SOFC) Situ neutron powder diffractions Electrodes ComputingMilieux_MISCELLANEOUS Virtual storage Neutrons Manganese Renewable Energy Sustainability and the Environment High-temperature electrochemical General Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry Atmospheric temperature range 021001 nanoscience & nanotechnology 0104 chemical sciences Crystallography chemistry Oxygen vacancies 13. Climate action Oxygen intercalation Reaction intermediates 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A Journal of Materials Chemistry A, Royal Society of Chemistry, 2016, 4 (30), pp.11635--11647. ⟨10.1039/c6ta03224a⟩ Journal of Materials Chemistry A, 2016, 4 (30), pp.11635--11647. ⟨10.1039/c6ta03224a⟩ |
| ISSN: | 2050-7488 |
| DOI: | 10.1039/c6ta03224a⟩ |
| Popis: | The structural behavior of the tetragonal NdBaMn2O5 phase, a member of the family of A-site ordered layered manganites that have been recently suggested as possible mixed ionic and electronic conductors, has been investigated by means of in situ neutron powder diffraction. Considering applications in energy production and storage devices and use of NdBaMn2O5+δ as an electrode in symmetrical cells, the study was carried out in relevant atmosphere conditions, i.e. dilute hydrogen (wet and dry) and dry air in the temperature range 25–800 °C. Neutron data under flowing hydrogen allowed monitoring of the structural phase transition from the charge-ordered to the charge-disordered state as a function of temperature. Slow reduction of the fully oxidised phase, NdBaMn2O6, previously formed from quick oxidation of the pristine material, enabled real-time observation of the intermediate NdBaMn2O5.5 phase and its crystal characterization up to 700 °C in the course of its conversion to NdBaMn2O5. Oxygen vacancy ordering within the Nd layers of NdBaMn2O5.5 correlated with antiferrodistortive orbital ordering of the Jahn–Teller Mn3+ ion in the square pyramids and octahedra results in large thermal expansion and relatively slow anisotropic oxygen diffusion occurring in the NdO layer. The four heating/cooling cycles evidenced no oxygen miscibility between the three distinct phases detected in the NdBaMn2O5+δ system with δ ∼ 0, 0.5 and 1 and clearly demonstrated that reversible oxygen intercalation/deintercalation underpins the phase stability of the LnBaMn2O5+δ materials to redox cycling and to wet atmosphere in high temperature electrochemical devices. |
| Databáze: | OpenAIRE |
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