Which outcome occurs when high-permeability polymeric fuel cell membranes experience excessive hydrogen crossover?

💡 Explanation

When hydrogen crossover happens, hydrogen diffuses rapidly across the membrane because the membrane is highly permeable. Then it reacts directly with the oxygen catalyst at the cathode. Therefore, catalyst poisoning results, rather than electrolyte depletion, swelling, or reduced resistence which involve different electrochemical processes or membrane properties.

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