Water transport in fuel cells is of interest since the hydration state of the electrolyte is strong related to its conductivity. This study focuses on one part of water transport in fuel cell membranes, namely diffusion. In order to study diffusion processes in a fuel cell membrane a computer model has been developed. It is validated using information reported for the electrolyte membrane material Nafion. When the model is compared to experimental data from the literature a maximum error of 24.7% is observed. Two effects in addition to molecular diffusion have been studied; interfacial absorption and desorption of water at the membrane surface, and convective mass transfer. The effect of convective mass transfer is shown to be negligible while the effects of absorption and desorption are significant. By completing this validation it allows for the additional studies in the future of diffusion in other types of proton exchange membranes and the improvement of fuel cell performance.

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