Abstract
The decoration of Pt1Ni3 nanoparticles supported on carbon black with Au adatoms and the electrocatalytic activity of the Au-decorated Pt1Ni3/C (Au/Pt1Ni3/C) for the oxidation of ethylene glycol (EG) in alkaline solution have been investigated. The decoration of Pt1Ni3/C with Au is performed by potentiostatically depositing a small amount of Au on Pt1Ni3/C, and the Au/Pt1Ni3/C catalysts with Au/Pt atomic ratios of ca. 0.02:1 and 0.08:1 are obtained. Physical and electrochemical characterizations reveal that a small part of the surface of Pt1Ni3 nanoparticles is covered by Au adatoms. In EG oxidation, the performances of Pt1Ni3/C before and after the Au decoration are quite different. Au/Pt1Ni3/C shows remarkably high peak intensity compared to Pt1Ni3/C, in spite of a decrease in the surface of Pt by Au adatoms. The low Pt content of Pt1Ni3 nanoparticles and the small Au loading also suggest advantages of the Au/Pt1Ni3/C catalysts in cost. The result of this study reveals a significant enhancing effect of Au adatoms on the activity of Pt1Ni3/C for EG oxidation.
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