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Durability of solid oxide cells : an experimental and modelling investigation based on synchrotron X-ray nano-tomography characterization

Abstract : This work aims at a better understanding of the high temperature Solid Oxide Cells degradation. An approach based on electrochemical tests, advanced post-test characterizations and multi-scale models has been used to investigate the links between the performances, the electrodes microstructure and their degradation. In that goal, long-term durability tests have been performed over thousand hours in different operating conditions. Electrode microstructures have been reconstructed by X-ray nano-holotomography for the pristine and the aged cells. It is worth noting that a special attention has been paid to improve both the process reliability for the tomographic experiments as well as the spatial resolution of the 3D reconstructed images. Thanks to the valuable 3D volumes, the Ni-YSZ microstructural properties of the H2 electrode have been quantified for the fresh and the aged samples. Then, a physically-based model for Nickel particle agglomeration has been adjusted on the microstructural parameters obtained by the 3D analysis and implemented in an in-house multi-scale modelling framework. Beforehand, it has been necessary to enrich the available numerical tool with a specific module dedicated to the oxygen electrode made in Mixed Ionic Electronic Conducting materials. Once validated on polarisation curves, the completed model has been used to quantify the contribution of Nickel agglomeration on the experimental degradation rates recorded in fuel cell and electrolysis modes.
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https://tel.archives-ouvertes.fr/tel-01689775
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Submitted on : Monday, January 22, 2018 - 2:33:07 PM
Last modification on : Wednesday, July 29, 2020 - 3:07:31 PM
Long-term archiving on: : Thursday, May 24, 2018 - 9:21:23 AM

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  • HAL Id : tel-01689775, version 1

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Maxime Hubert. Durability of solid oxide cells : an experimental and modelling investigation based on synchrotron X-ray nano-tomography characterization. Theoretical and/or physical chemistry. Université Grenoble Alpes, 2017. English. ⟨NNT : 2017GREAI011⟩. ⟨tel-01689775⟩

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