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In a polymer electrolyte membrane at low humidity, which outcome is most likely?

A)Proton conductivity drops significantly
B)Increased catalyst layer utilization
C)Membrane swelling becomes prevalent
D)Reduced methanol crossover effect

💡 Explanation

Dehydration reduces proton transport because the Grotthuss Mechanism relies on water molecules to hop hydrogen ions; therefore conductivity drops, rather than enhanced catalyst activity because reactants are impacted by membrane conditions.

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