Which outcome results when a platinum catalyst used in a fuel cell is poisoned by carbon monoxide?

💡 Explanation

When carbon monoxide poisons the catalyst, chemisorption blocks active sites because CO binds more strongly to platinum than hydrogen, which reduces the surface area available for hydrogen adsorption and oxidation. Therefore, reduced hydrogen adsorption results, rather than other effects which are caused by changes in electrolyte, platinum stability or membrane properties.

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