Diffusion of Water in Nafion 115 Membranes

In this paper, experimental and simulated data for the diffusion of water across Nafion membranes as a function of the water activity gradient are presented. The gradient in the activity of water across the membrane was varied by changing the flow rate and pressure of nitrogen gas on one side of the membrane. The other side of the membrane was equilibrated with liquid water. It was found that the model predictions are very sensitive to the value of the diffusion coefficient of water in Nafion. Using the Fickian diffusion coefficient extracted from self‐diffusion measurements reported in the literature, the model simulations matched experimental data with less than 5% error over a wide range of operating conditions. © 2000 The Electrochemical Society. All rights reserved.