Which effect reduces catalytic activity of platinum nanoparticles in a fuel cell over time?

💡 Explanation

When platinum nanoparticle surfaces adsorb hydrogen sulfide, surface poisoning by this process occurs due to strong chemisorption which blocks active sites where hydrogen oxidation should occur, impeding catalytic function. Therefore, lowered efficiency from sulfide absorption occurs, rather than delamination, shorting, or depletion which require alternative deterioration pathways.

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