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Article Dans Une Revue Membranes Année : 2021

The Impact of Chemical-Mechanical Ex Situ Aging on PFSA Membranes for Fuel Cells

Résumé

A proton-exchange membrane fuel cell (PEMFC) constitutes today one of the preferred technol-ogies to promote hydrogen-based alternative energies. However, the large-scale deployment of PEMFCs is still hampered by insufficient durability and reliability. In particular, the degrada-tion of the polyelectrolyte membrane, caused by harsh mechanical and chemical stresses expe-rienced during fuel cell operation, has been identified as one of the main factors restricting the PEMFC lifetime. An innovative chemical-mechanical ex situ aging device was developed to simultaneously expose the membrane to mechanical fatigue and an oxidizing environment (i.e., free radicals) in order to reproduce conditions close to those encountered in fuel cell systems. A cyclic compressive stress of 5 or 10 MPa was applied during several hours while a degrading so-lution (H2O2 or a Fenton solution) was circulated in contact with the membrane. The results demonstrated that both composite Nafion™ XL and non-reinforced Nafion™ NR211 membranes are significantly degraded by the conjoint mechanical and chemical stress exposure. The fluoride emission rate (FER) was generally slightly lower with XL than with NR211, which could be at-tributed to the degradation mitigation strategies developed for composite XL, except when the pressure level or the aging duration were increased, suggesting a limitation of the improved durability of XL.
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Dates et versions

hal-03228615 , version 1 (18-05-2021)

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Mylène Robert, Assma El Kaddouri, Jean-Christophe Perrin, Kévin Mozet, Jérôme Dillet, et al.. The Impact of Chemical-Mechanical Ex Situ Aging on PFSA Membranes for Fuel Cells. Membranes, 2021, ⟨10.3390/membranes11050366⟩. ⟨hal-03228615⟩
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