Elucidating the transient characteristics of a polymer electrolyte fuel cell in consideration of its applications, such as electric vehicles, is an important step in its development. In this study, we created a mathematical model to predict the transient behavior of a unit-PEFC, analyzed the model numerically, and compared the results with experimental results. Consequently, we elucidated that the transient behavior of a PEFC is summarized by two physical phenomena: (1) water redistribution in the polymer electrolyte membrane, (2) the discharge/charge of electric double layer capacitance.

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