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    Phosphonic acid functionalized poly(pentafluorostyrene) as polyelectrolyte membrane for fuel cell application

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    Date
    2017
    Author
    Atanasov, Vladimir
    Kerres, Jochen
    Oleynikov, Andrey
    Xia, Jiabing
    Lyonnard, Sandrine
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    Abstract
    In this paper we introduce polyelectrolyte membranes based on phosphonated poly(pentafluorostyrene) (PPFS) and their performances in a fuel cell. The polyelectrolytes were obtained via partial phosphonation of PPFS varying the phosphonation degree from 17 to 66%. These membranes showed a high resistance to temperature (Tdecomp. = 355–381 °C) and radical attack (96–288 h in Fenton's test). A blend membrane consisting of 82 wt% fully phosphonated PPFS and 18 wt% poly(benzimidazole) is compared to the 66% phosphonated membrane having similar ion-conductivity (σ = 57 mS cm−1 at 120 °C, 90% RH). In the fuel cell the blend showed the best performance reaching 0.40 W cm−2 against 0.34 W cm−2 for the 42 wt% phosphonated membrane and 0.35 W cm−2 for Nafion 212. Furthermore, the blend maintained its operation at potentiostatic regime (0.5 V) for 620 h without declining in its performance. The highest power density of 0.78 W cm−2 was reached for the blend with a thickness of 15 μm using humidified oxygen (RH > 90%) at the cathode side. The switch from humidified to dry gasses during operation reduced the current density down to 0.6 A cm−2, but the cell maintained under operation for 66 h
    URI
    http://hdl.handle.net/10394/20858
    https://doi.org/10.1016/j.jpowsour.2017.01.085
    https://www.sciencedirect.com/science/article/pii/S0378775317300952
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    • Faculty of Natural and Agricultural Sciences [4855]

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