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Which outcome reduces the fuel cell's performance because catalyst poisoning occurs?

A)Blocked catalyst active sites
B)Lowered electrolyte ionic conductivity
C)Increased electrode surface area
D)Enhanced reactant diffusion rates

💡 Explanation

Blocked active sites cause a decrease in available reaction sites, which impede the electrochemical oxidation of fuel molecules at the anode because catalyst poisoning creates surface films. Therefore, fuel cell reactions rate decreases, rather than benefits like enhanced diffusion, because surface adsorption is hindered in active reaction zone.

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