Abstract
The proton conductivity of commercial perfluorinated membranes Nafion-115, MF-4SC and synthesized nanocomposite membranes (polyvinylidenefluoride-sulfonated polystyrene, ultra high molecular weight polyethylene-sulfonated polystyrene, polypropylene-sulfonated polystyrene) is studied as a function of concentration of the water-methanol solution sorbed by membranes, by means of contact impedancemetry with the regulated pressure on the electrode-membrane contacts. The optimal experimental conditions are shown to correspond to a pack of several membranes pressed between gold electrodes with the strength of no less than 40 kg/cm2. It is found that the specific conductivity of synthesized membranes in water at 24°C is 50–120 mS/cm, which virtually coincides with the corresponding values for Nafion-115 and MF-4SC. As the concentration of the water-methanol solution increases from 0 to 60%, the specific conductivity of Nafion-115 and MF-4SC membranes decreases by 30%. The specific conductivity of synthesized nanocomposite membranes decreases by 40–55% in this concentration range.
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Original Russian Text © V.Ch. Bokun, D.A. Kritskaya, E.F. Abdrashitov, A.N. Ponomarev, E.A. Sanginov, A.B. Yaroslavtsev, Yu.A. Dobrovol’skii, 2015, published in Elektrokhimiya, 2015, Vol. 51, No. 5, pp. 504–511.
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Bokun, V.C., Kritskaya, D.A., Abdrashitov, E.F. et al. Proton conductivity of perfluorinated and nanocomposite ion exchange membranes in aqueous and water-methanol solutions. Russ J Electrochem 51, 435–441 (2015). https://doi.org/10.1134/S1023193515050031
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DOI: https://doi.org/10.1134/S1023193515050031