Probing the evolution upon aging of ionomer nanostructure in fuel cell electrodes using SANS
Automotive with very low pollutants emission powered by a PEMFC are now commercially available. Increasing the durability of this system is a prerequisite to make it really cost competitive against existing technologies. However, the degradation phenomena of the components of the membrane electrode assembly (MEA) are still not well described. Especially, despite its major role, the evolution upon aging of the proton conducting polymer (ionomer) within the electrode has not been studied because of the lack of relevant technics available at the laboratory scale. The aim of this proposed experiment is to study the ionomer structure and swelling properties in-situ and during operation of one fresh and two samples aged in different conditions of humidity. Operando investigation of the structure of the ionomer within very thin electrode (30 µm) requires to record SANS spectra in a broad range of Q (0.005 to 5 A-1) with a highly collimated beam and a dedicated 10 µm x 8 mm slit. Thus, a very high neutron flux, a high resolution diffractometer and a well-controlled sample environment (temperature) are needed. The feasibility of the experiment has been previously demonstrated.
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MORIN Arnaud; CHABOT Florian; CLEMENT Philippe; ESCRIBANO Sylvie; GEBEL Gerard; JACQMIN Laurent; LYONNARD Sandrine; MICOUD Fabrice; PORCAR Lionel; ROSINI Sebastien and VANDENBERGHE Florent. (2020). Probing the evolution upon aging of ionomer nanostructure in fuel cell electrodes using SANS. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-175
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