Abstract
Alkaline environment offers the increased electrocatalystic activity and stability of non-precious metal group catalysts for the oxygen reduction reaction. However, sluggish hydrogen oxidation reaction (HOR) activity of electrocatalysts under alkaline environment has remained an issue to overcome. In this presentation, we report the hydrogen oxidation inhibition by organic cation adsoprtion to expalin the low HOR activity of Pt based electrocatalyst. The HOR activity of Pt based electrocatalyst in several organic cationic solutions including tetramethylammonium, tetrabuthylammonium, and tetrabutylphosphonium is investigated using rotating disk electrodes. Time-dependent and potential driven adsorption behaviors of the cationic groups suggest that this adsorption has rather complex chemisorption nature rather than just simple adsorption. The new proposed inhibition mechanism may give useful insites on how to design ionomeric binders and electrocatalysts for advanced alkaline membrane fuel cells.
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