Abstract
The effect of adsorbed sulfide (S2–ads) on methanol (MeOH) electro-oxidation reaction (MOR) taking place on carbon-supported Pt nanoparticles (NPs) was investigated using electrochemical and attenuated-total-reflection (ATR)-FTIR spectroscopic techniques. The observed substantial enhancement in MOR activity per active site was rationalized by an enhanced parallel reaction pathway by the S2– adsorption that did not lead to poisonous CO. Moreover, there were delayed/suppressed adsorption of electrolyte anions and oxygen-containing species and increased amount of isolated free water monomers caused by the sulfide adsorption-induced more negatively charged Pt sites, which led to more available active sites, weakened bonding interaction between the Pt NPs and oxygen-containing species, and more active water species for MOR along the parallel reaction pathway.
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