The Molecular‐Level Interpretation of Salt Uptake and Anion Transport in Nafion Membranes

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Abstract
The idealized “cluster‐network” structure for Nafion® cation exchange membranes has been used to generate molecular‐level models for membrane salt solubility and anion transport. Equilibrium salt uptake by Nafion was found to be dependent on the size and wall charge of the membrane's inverted micelle clusters. The anion/membrane binary interaction transport parameter was dependent on membrane tortuosity and the electrostatic repulsion forces in the narrow pores which interconnect the inverted micelles. The salt solubility model predicted membrane cation concentrations to within 8% for external concentrations of 1.0–5.0M. The transport analysis accurately predicted the concentration dependence of the Cl−/membrane binary interaction parameters.

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