Reaction Mechanisms of La2NiO4+δ Oxygen Electrodes Operated in Electrolysis and Fuel Cell Mode
| Autor: | G. Sdanghi, L. Yefsah, F. Mauvy, E. Djurado, T. David, J-M. Bassat, J. Laurencin |
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| Přispěvatelé: | CEA, Contributeur MAP, Département Technique Conversion et Hydrogène (DTCH), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux Interfaces ELectrochimie (MIEL), Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI), Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Institut de Chimie du CNRS (INC)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), ANR-18-CE05-0036,ECOREVE,EleCtrOdes architecturées pour la Réalisation d'Electrolyseurs de la Vapeur d'Eau à haute température(2018) |
| Rok vydání: | 2022 |
| Předmět: |
[CHIM.MATE] Chemical Sciences/Material chemistry
EIS Renewable Energy Sustainability and the Environment polarization curves Modeling Oxygen electrode reaction [CHIM.MATE]Chemical Sciences/Material chemistry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials nickelates Materials Chemistry Electrochemistry SOFC SOEC [CHIM.OTHE]Chemical Sciences/Other |
| Zdroj: | Journal of The Electrochemical Society Journal of The Electrochemical Society, 2022, 169, pp.034518 Journal of The Electrochemical Society, 2022, 169 (3), 034518 (15 p.). ⟨10.1149/1945-7111/ac58c3⟩ |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1945-7111/ac58c3 |
| Popis: | International audience; The reaction mechanisms governing the electrochemical behavior of porous La2NiO4+δ (LNO) nickelate used as oxygen electrode in SOCs (Solid Oxide Cells) have been investigated through a coupled experimental and modeling approach. In this frame, a set of experiments has been performed on a symmetrical cell using a three-electrode setup. A micro-scale electrode model taking into account two reaction pathways, i.e. bulk and surface paths, has been developed to describe the experimental results. The microstructural parameters of the LNO electrode have been obtained by FIB-SEM tomography, thus reducing the number of unknown model parameters. For the determination of the missing parameters, the model has been calibrated using the experimental polarization curves measured at different temperatures. The model was then validated using electrochemical impedance diagrams recorded at open circuit potential (OCP) and under polarization for different oxygen partial pressures.It has been here evidenced that the LNO reaction mechanism depends on both the temperature and the dc polarization. Under air and at OCP, the reaction mechanism was found to be controlled by the bulk path at 650 °C and by the surface path at higher temperatures. A transition from the bulk path towards the surface path was observed when increasing the cathodic dc current. These results have been interpreted by considering the evolution of the LNO over stoichiometry as a function of the polarization. Better electrochemical performances have been detected under anodic polarization. In addition, the evolution of the electrode polarization resistance with the oxygen partial pressure has been also investigated. |
| Databáze: | OpenAIRE |
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