Halide and Sulfate Ion Diffusion in Nafion Membranes

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Abstract
The self‐diffusion coefficients of chloride, iodide, and sulfate anions have been measured in Nafion® perfluorosulfonate and perfluorocarboxylate membranes using radiotracer methods. Values were measured with the membranes in equilibrium with hot, concentrated brine and caustic solutions which are typical of brine electrolysis cells, and also in dilute solution environments. Several differences were found for these diffusion coefficients, and those of cations measured previously, compared to conventional ion exchange polymers. It is postulated that separate diffusional pathways exist for cations and anions in these polymers, and that this feature contributes to the high permselectivity which these polymers exhibit.

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