Which mechanism causes catalyst deactivation in a fuel cell?

💡 Explanation

Surface poisoning deactivates the catalyst because a foreign substance adsorbs to the catalytic material, thereby preventing reactants from accessing active sites. Therefore, catalytic activity drops off, rather than changes to proton mobility or flooding.

• Which outcome occurs when applying reverse bias excessively to Zener diodes?
• Which mechanism causes increased product formation rate in a catalytic converter exposed to elevated exhaust temperatures?
• Using ferrite cores in transformer construction, which mechanism reduces eddy current losses?
• Which effect inhibits long-range electron transfer within entangled molecules?
• Which outcome occurs when fluid velocity rises in a valve?
• Which mechanism inhibits thermal runaway during gallium arsenide solidification?