A new method to prepare high performance perfluorinated sulfonic acid ionomer/porous expanded polytetrafluoroethylene composite membranes based on perfluorinated sulfonyl fluoride polymer solution

Perfluorinated sulfonyl fluoride (PFSF) resin, the precursor of perfluorinated sulfonic acid (PFSA) ionomer is successfully dissolved in perfluorinated solvents, and its hydrophobic nature is utilized to resolve the difficulty of impregnating hydrophilic PFSA solution into hydrophobic porous expande...

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Bibliographic Details
Published in:Journal of power sources 2013-12, Vol.243, p.392-395
Main Authors: Yang, Libin, Li, Hong, Ai, Fei, Chen, Xiaoyong, Tang, Junkun, Zhu, Yan, Wang, Chaonan, Yuan, Wang Zhang, Zhang, Yongming
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fluorides
Fuel cell
Fuel cells
Impregnated composite membrane
Ionic conductivity
Ionomers
Membranes
Perfluorinated sulfonic acid
Perfluorinated sulfonyl fluoride solution
Poly(tetrafluoroethylene)
Polytetrafluoroethylenes
Precursors
Solvents
Sulfonic acid
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Summary:Perfluorinated sulfonyl fluoride (PFSF) resin, the precursor of perfluorinated sulfonic acid (PFSA) ionomer is successfully dissolved in perfluorinated solvents, and its hydrophobic nature is utilized to resolve the difficulty of impregnating hydrophilic PFSA solution into hydrophobic porous expanded polytetrafluoroethylene (ePTFE). The composite membrane fabricated through such simple but effective method is well impregnated, leading to better ionic conductivity and lower gas permeability. The fuel cell constructed with PFSF solution based membranes shows superior performance as compared to that of its aqueous PFSA solution based counterpart, which is comparable to that of commercial Nafion® 211. •A simple but effective new method to fabricate PFSA/ePTFE membrane was developed.•The hydrophobic PFSF solution was utilized to resolve the impregnation problem.•The membrane properties are much better than those of traditional way made membrane.•The new made membrane is totally comparable to Nafion 211 in PEMFC performance.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.06.056