A Study of Capillary Porous Structure and Sorption Properties of Nafion Proton‐Exchange Membranes Swollen in Water

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Abstract
The standard porosimetry method (SPM) was used to study capillary porous and sorption properties of Nafion® proton‐exchange membranes. Pore volume‐size and surface‐size distributions were recorded together with water distributions as a function of capillary pressure and desorption isotherms. The measurements were performed at 20 and 80°C; only a small temperature effect was found for the porous volume structure. Using these data, the charge density at the inner pore surfaces was evaluated. The estimate suggested only a small degree of diffuseness of the proton double layer at the inner pore surface.

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