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This study is to understand the impact of operating condition, especially initial operation temperature (T ini) which is set in high temperature range, on the temperature profile of the interface between PEM (polymer electrolyte membrane) and catalyst layer at the cathode (i.e., the reaction surface) in a single PEFC (polymer electrolyte fuel cell). A 1D multi-plate heat transfer model based on the temperature data of separator measured using thermograph in a power generation experiment was developed to evaluate the reaction surface temperature (T react). This study investigated the effects of flow rate, relative humidity and type of supply gas as well as T ini on the temperature distribution on reaction surface. The results obtained in O 2 supply case show that, the temperature rise at the segments near the outlet of cell decreases with increasing T ini irrespective of relative humidity of supply gas (RH), while it is not seen in air supply case. Regarding the segments except near the outlet in O 2 supply case, T react-T ini increases with increasing T ini for 40% RH. The temperature distribution on reaction surface in O 2 supply case is wider with increasing T ini as well as decreasing RH, though that in air supply case is relatively even.

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