Long-term durability study of perfluoropolymer membranes in low humidification conditions |
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Authors: | Alfonso Pozio Alessia Cemmi Francesco Mura Amedeo Masci Emanuele Serra Rodrigo Ferreira Silva |
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Institution: | (1) ENEA, C.R. Casaccia, Via Anguillarese 301, S. Maria di Galeria, 00123 Rome, Italy |
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Abstract: | This paper reports a study on the understanding of the performance decrease mechanisms of polymer electrolyte fuel cells under
critical operating conditions. In order to investigate the durability of perfluorosulfonate membranes at low humidification
conditions, long-term fuel cell tests have been carried out. Results evidenced a strong effect of low relative humidity on
the commercial polymer membrane lifetime. Prolonged dehydration of the membranes led to a decrease of the three-dimensional
reaction zone due to the ionomer degradation in the catalytic layer and a continuous loss of material in the membrane evidenced
by a thickness decrease. The last effect provoked a collapse of the electrode structure. |
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