title: Electrocatalytic activity of Pt subnano/nanoclusters stabilized by pristine graphene nanosheets.
abstract: Downsizing the Pt particle to the atomic level in the electro-catalysts is highly desirable to enhance its utilization efficiency in fuel cells. In this study, Pt subnano/nanoclusters were stabilized by the pristine graphene nanosheets (GNSs) derived from chemical vapor deposition and the resulting Pt/GNS hybrids were examined as catalysts for electro-oxidation of alcohols (methanol, ethanol, ethylene glycol and glycerol). In spite of the strong hydrophobic surface, the GNS was proved to be a promising catalyst support because the edges and defects in the GNS could effectively anchor and stabilize the Pt subnano/nanoclusters. The Pt/GNS catalyst showed an extremely high electrochemical active surface area and superior catalytic activity for alcohol oxidation compared with the commercial Pt/carbon black catalyst. The enhanced catalytic performance was attributed to the presence of the discrete Pt subnano/nanoclusters as well as the modulation of the electronic properties of Pt nanoparticles through the chemical interaction of Pt atoms with the edges and defects of the GNS support.
authors.affiliation: College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China. feyshen@scut.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Shen
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Zhang
authors.forename: Kaijun
authors.initials: K
authors.lastname: Xiao
authors.forename: Jingyu
authors.initials: J
authors.lastname: Xi