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Article Dans Une Revue Journal of Power Sources Année : 2022

A chemical-mechanical ex-situ aging of perfluorosulfonic-acid membranes for fuel cells: impact on the structure and the functional properties

Laetitia Dubau

Résumé

Perfluorosulfonic acid (PFSA) membranes are key components for the operation of Polymer Electrolyte Membrane Fuel Cells (PEMFC). They undergo harsh conditions in terms of chemical environment and mechanical fatigue leading to irreversible degradations, up to their failure and to the Fuel Cell (FC) shutdown in worst cases. Through an ex-situ approach, this study aims to provide new insights about the impact of conjoint mechanical and chemical stresses on the structure and the functional properties of PFSA membranes. In this regard, various aging tests have been carried out using a custom-made device able to combine the application of a mechanical stress (sinusoidal profile) and the exposure to an environment containing free radicals (i.e. Fenton's reagents). After about twenty hours of accelerated aging test the analysis of the aged membranes permitted to demonstrate that the exposure to the combined stress significantly altered the morphology of Nafion ™ XL membrane, with the appearance of bubbles close to the membrane surface and even delamination at the PFSA/reinforcement interface. On the other hand, and rather paradoxically, the water sorption and self-diffusion properties of the aged membranes as well as their cell performances remained satisfactory.
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Dates et versions

hal-03483205 , version 1 (16-12-2021)
hal-03483205 , version 2 (08-02-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Mylène Robert, Assma El Kaddouri, Marie Crouillere, Jean-Christophe Perrin, Laetitia Dubau, et al.. A chemical-mechanical ex-situ aging of perfluorosulfonic-acid membranes for fuel cells: impact on the structure and the functional properties. Journal of Power Sources, 2022, 520, pp.230911. ⟨10.1016/j.jpowsour.2021.230911⟩. ⟨hal-03483205v2⟩
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