Which mechanism restricts the maximum operating temperature of a polymer electrolyte membrane fuel cell (PEMFC)?

💡 Explanation

When temperature increases and humidity decreases, the membrane loses water through evaporation because vapor pressure rises, reducing proton conductivity significantly and thus cell performance. Therefore, electrolyte dehydration results, rather than carbon corrosion, swelling, or delamination, which involve alternative degradation mechanisms at higher temperatures or different causes.

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