Abstract
The electrocatalytic reactivity of Pt nanoparticles supported on high-pressure, high-temperature diamond particles toward adsorbed CO, methanol, and formic acid oxidation is investigated employing differential electrochemical mass spectrometry (DEMS). Surface treatment of diamond particles, employed as dimensionally stable electrocatalyst supports, leads to materials with surfaces featuring mainly hydrogen (HDP) or oxygen-based functional groups (ODP). Pt nanoparticles with average diameter below 5 nm were generated by impregnation of the modified diamond particles. The voltammetric responses associated with the oxidation of adsorbed CO appeared unaffected by the surface termination of the diamond support. However, significant differences were observed for methanol oxidation in acid solutions, with Pt/HDP producing smaller current densities than Pt/ODP and a commercially available Pt catalyst (Pt/E-TEK). DEMS studies show higher conversion efficiencies to CO2 for Pt/ODP and Pt/E-TEK, while Pt/HDP exhibite...
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