Determination of water diffusion coefficients in perfluorosulfonate ionomeric membranes

Pulsed field gradient spin-echo 1 H NMR measurements of 1 H intradiffusion coefficients at 30 o C in hydrated Nafion membranes are reported. The dependence of the 1 H self-diffusion coefficient on membrane water content was a central part of this investigation. 1 H diffusion coefficients ranged from 0.6×10 −6 to 5.8×10 −6 cm 2 /s for the range of membrane water content 2-14 water molecules per sulfonate