Observation of fuel cell membrane degradation by Ex situ and in situ electron paramagnetic resonance

Vogel, B, Aleksandrova, E, Mitov, S, Krafft, M, Dreizler, A, Kerres, J, Hein, M and Roduner, E (2008) Observation of fuel cell membrane degradation by Ex situ and in situ electron paramagnetic resonance. Journal of the Electrochemical Society, 155 (6). B570-B574. ISSN 1945-7111

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Abstract

Aiming at the development of accelerated stability tests of perfluorinated and polyaromatic proton conducting fuel cell polymer membranes, free-radical degradation was initiated by exposure to .OH radicals generated from hydrogen peroxide. All investigations were performed by electron paramagnetic resonance on various monomer and polymer solutions as well as on bare and coated polymers. No signals indicating an .OH attack on Nafion ionomers were detected, in contrast to all polyaromatic membrane materials. Nevertheless, in situ spin trap measurements with Nafion membranes reveal strong signals which formally belong to trapped H atoms but are not related to degradation. Relative to the Faraday electrons from the electrochemical reaction, they appear on a parts per million level.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Environmental Sciences
Depositing User:	Rosie Cullington
Date Deposited:	26 Feb 2011 12:06
Last Modified:	24 Oct 2022 01:07
URI:	https://ueaeprints.uea.ac.uk/id/eprint/24805
DOI:	10.1149/1.2901061

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