Abstract
Previously proposed approaches to determining diffusion parameters of mixed-cation membranes have been tested to describe ionic conductance and H+/M+ (M = Li, Na, K) interdiffusion data for asymmetric MK-40-based membranes modified with a thin layer of MF-4SK perfluorinated membrane material containing silica and zirconia additions. The diffusion coefficients, effective ion exchange constants, and asymmetry effects in the membranes are evaluated. The conclusion is made that there is an additional barrier to ion transport across the surface of MK-40 membranes.
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