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Caractérisation des hétérogénéités de fonctionnement et de dégradation au sein d’un électrolyseur à membrane échangeuse de protons (PEM)

Abstract : Proton Exchange Membrane (PEM) electrolysis is among the best solutions to store energy from intermittent power sources such as solar and wind. The green hydrogen produced by this technology can meet the needs of industries that already consume hydrogen or can be used for new applications such as fuel cell cars. To continue the deployment of PEM electrolyzers, it is necessary to increase their lifetime and the active surface area of cells. By doing this, operating heterogeneities related to the distribution of gas/water, current and temperature may appear. This work aims to characterize the aging mechanisms and the heterogeneities that have a negative impact on the performance of the electrolyzer. A segmented cell for measuring local current densities and local potentials was developed. Different titanium porous transport layers (PTLs) were characterized and their influence on the transport of electrical charges and gas/water has been analyzed, which allowed identifying problems related to the variation of PTL microstructure along the electrolyzer. Also, a model describing the contact resistance between the catalyst layer and the PTL was proposed. The membrane temperature between the inlet and the outlet of the cell was estimated with an innovative method based on the electrochemical impedance spectroscopy. This method allowed characterizing the temperature differences with the water circulating in the channels as a function of current density. An accelerated stress protocol was developed and the influence of intermittent operation was studied. A critical potential threshold that accelerates aging was identified and performance recoveries linked to periodic drop of the cell potential were observed.
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https://hal.univ-lorraine.fr/tel-02942062
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Submitted on : Thursday, September 17, 2020 - 3:21:07 PM
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  • HAL Id : tel-02942062, version 1

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Julian Parra-Restrepo. Caractérisation des hétérogénéités de fonctionnement et de dégradation au sein d’un électrolyseur à membrane échangeuse de protons (PEM). Sciences de l'ingénieur [physics]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0044⟩. ⟨tel-02942062⟩

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