Abstract
The factors which influence selective transport are reviewed. In available membranes, selectivity is controlled primarily by concentration effects rather than by mobilities. The fluxes of electric current and matter through membranes are analyzed in terms of the thermodynamics of irreversible processes. The effects of a selective membrane on the operation of a silver/zinc battery are discussed. The charge‐selective character of the membrane causes sharp changes in electrolyte concentration when current flows through the boundary between membrane and electrolyte. This introduces both a high resistance film and a concentration potential; both of these operate to reduce the power output of the cell.
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