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Fabrication and characterization of PFSI/ePTFE composite proton exchange membranes of polymer electrolyte fuel cells
journal contribution
posted on 2007-04-30, 00:00 authored by H Tang, M Pan, S P Jiang, Xiaoen Wang, Y RuanPFSI/ePTFE composite proton exchange membranes were fabricated by impregnating perfluorosulfonic acid resin (PFSI resin, Nafion) into chemically modified expanded PTFE (ePTFE) matrix. Chemical modification of sodium–naphthalene treatment and N-methylol acrylamide (NMA) grafting decreased the contact angle of the as-received ePTFE from 125 ± 0.5° to 67 ± 0.5°, effectively converting the as-received hydrophobic ePTFE to a hydrophilic ePTFE matrix. The composite membrane fabricated with the hydrophilic ePTFE have higher impregnated PFSI loading, much lower porosity and better PTFE/PFSI interface contact, as compared to the composite membranes with the as-received ePTFE. This leads to much lower gas permeability and significantly improves the durability under an accelerated dry/wet cycle test. The fuel cell made from the PFSI/ePTFE composite membranes with hydrophilic ePTFE showed superior performance as compared to that with the composite membrane made from the as-received ePTFE and Nafion 211 membrane.
History
Journal
Electrochimica ActaVolume
52Issue
16Pagination
5304 - 5311Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0013-4686Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2007, ElsevierUsage metrics
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