Authors
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Li, X. ; Drache, M. ; Ke, X. ; Gohs, U. ; Beuermann, S.
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Title
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Fuel cell application of high temperature polymer electrolyte membranes obtained by graft copolymerization of acrylic acid and 2-hydroxyethylmethacrylate on ETFE backbone material
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Date
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01.01.2016
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Number
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46542
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Abstract
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Proton exchange membranes for high temperature fuel cell applications were obtained via graft copolymerizations on commercial poly(ethylene-alt-tetrafluoroethylene) (ETFE) films. ETFE was activated by electron beam treatment, and the hydrophilic monomers acrylic acid and hydroxyethyl methacrylate were grafted to ETFE. The maximum grafting level was 620%. The grafted membranes were doped with the proton carrier phosphoric acid leading to a maximum doping level of 450%. Stress–strain measurements indicate good mechanical stability of the composite membranes. The polymer–acid membranes were tested in a H2/O2 fuel cell. At a current density of 200·mA···cm-2 a stable power density of 113·mW···cm-2 was determined at 120·°C. The results show that high phosphoric acid contents associated with high proton conductivity may be obtained with a copolymer containing acrylic acid.
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Publisher
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Macromolecular Materials and Engineering
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Wikidata
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Citation
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Macromolecular Materials and Engineering 301 (2016) 56-64
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DOI
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https://doi.org/10.1002/mame.201500207
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Tags
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electron beam irradiation etfe backbone material graft copolymers hydrophilic monomers pem
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