Abstract
Proton conductivity of polymer electrolyte membrane (PEM), which is used as electrolyte of the PEFC, depends on water content of PEM. It is very difficult to measure local water transport phenomena, so we use numerical analysis to grasp this effect. In this study, the effect of water in a PEFC was discussed by comparing experimental results with analytical results, which were conducted by unsteady two-dimensional model. Analytical results showed good agreement with experimental results of voltage response after sudden supplied gas humidity change for the conditions without flooding. In addition to these study, by calculating humidity distributions in a PEFC, we illustrated the relationship between water content of PEM and cell voltage.
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