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 mechanism causes gravitational redshift observed from pulsars?
• Which outcome occurs when a deuterium-tritium plasma reaches high Lawson criterion values?
• Which mechanism limits the maximum solubility within molecular crystals?
• Which outcome occurs when reflective coating thickness varies in optical flats?
• Which limitation impacts long-distance fiber amplifiers reliant on Stimulated Brillouin scattering?
• Which mechanism increases energy dissipation in pumped hydro storage?