title: Catalytic Performance of Pt/Reduced Graphene Oxide Composites to Methanol Electrochemical Oxidation: Optimization of Mass-Specific Activity.
abstract: Series of catalysts made of Pt nanoparticles supported on reduced graphene oxides (Pt/RGO) were synthesized and tested in methanol oxidation reaction, aiming for optimizing the mass-specific activity of prepared Pt/RGO composites. The loading amount of Pt is controlled through setting different reaction time and determined precisely by atomic absorption spectrophotometer. The structure of Pt/RGO composites is characterized by X-ray diffraction, transmission electron microscopy and Raman spectroscopy. The electrochemical testing data reveal that the Pt/RGO-mass-specific activity, judged by current density and long-term stability, is maximized in the sample in which cooperation of the Pt loading amount and electrochemical active surface area (ECSA) per amount of Pt is best optimized. The performance of the catalyst with smallest Pt particles or highest Pt loading amount is dragged down by either too less Pt loading or poor ECSA per amount of Pt. The results in this research demonstrate that the mass-normalized activity of whole catalyst, which is associated with the anticipated power output per amount of catalyst, could be enhanced significantly by deliberate tuning of fabrication process.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Xue
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Pei-Pei
authors.initials: PP
authors.lastname: Huang
authors.forename: Xing-Rui
authors.initials: XR
authors.lastname: Liu
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Yang
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Wei-Guo
authors.initials: WG
authors.lastname: Song
authors.forename: Dong-Wei
authors.initials: DW
authors.lastname: Yan
authors.forename: Zhan-Jun
authors.initials: ZJ
authors.lastname: Gu