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Which consequence results when increasing temperature exceeds a PEM fuel cell’s constraint?

A)Increased membrane proton conductivity offsets degradation
B)Oxygen vacancies stabilize, preventing electrode oxidation
C)Increased activation energy slows the catalysis
D)Reduced Nernst potential decreases available voltage outlet

💡 Explanation

Increased temperature degrades the proton exchange membrane. This increases internal resistance, so the Nernst potential decreases. The decrease leads to reduced available voltage, rather than an offset. Catalyst activity might then become more limited because the voltage constraint dominates performance.

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