Which outcome occurs in a high-temperature polymer electrolyte membrane (PEM) fuel cell using phosphoric acid when the membrane dries?

A)Increased proton conductivity occurs rapidly

B)Fuel crossover abruptly increases, too✓

C)Increased hydrogen bonding facilitates catalysis

D)Covalent bond breakage forms radicals

💡 Explanation

Drying increases fuel crossover because the proton transport mechanism now requires unbroken liquid electrolyte paths; therefore fuel crosses rather than remaining separated, increasing efficiency losses, because hydrogen bonding with water declines.

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Which outcome occurs in a high-temperature polymer electrolyte membrane (PEM) fuel cell using phosphoric acid when the membrane dries?

💡 Explanation

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