Channel orientation anisotropy in perfluorosulfonic acid/SiO2 composite proton exchange membranes: Water self-diffusion study using NMR

► Channels orientation anisotropy in PFSA/SiO2 composite was investigated. ► Diffusion-exchange model was used for obtaining self-diffusion coefficients. ► Dependence of D and exchange rate k as a function of silica concentration was reported.