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Which outcome in a hydrogen fuel cell using a Nafion membrane occurs due to increased temperature extremes?

A)Increased membrane proton conductivity
B)Water back diffusion reduction
C)Decreased electrode kinetic overpotential
D)Accelerated membrane chemical degradation

💡 Explanation

Accelerated chemical degradation results because at high temperature, the dehydration reduces proton conductivity thus increasing the local reactant concentrations and promoting radical formation which then causes attack. Therefore degradation occurs rather than the other options which actually are hindered.

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