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Applied surface science v.433, 2018년, pp.840 - 846   SCI SCIE
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Novel synthesis of core-shell Au-Pt dendritic nanoparticles supported on carbon black for enhanced methanol electro-oxidation

Cao, Ribing (Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, No.368 Youyi Avenue, Wuchang, Wuhan 430062, China ) ; Xia, Tiantian (Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, No.368 Youyi Avenue, Wuchang, Wuhan 430062, China ) ; Zhu, Ruizhi (Key Laboratory of Tobacco Chemistry of Yunnan Province, R&D Center of China Tobacco Yunnan Industrial Co., Ltd.,China ) ; Liu, Zhihua (Key Laboratory of Tobacco Chemistry of Yunnan Province, R&D Center of China Tobacco Yunnan Industrial Co., Ltd.,China ) ; Guo, Jinming (Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria ) ; Chang, Gang (Hubei Collaborative Innovation Center for Advanced Organic Che ) ; Zhang, Zaoli ; Liu, Xiong ; He, Yunbin ;
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    Abstract Core-shell Au-Pt dendritic nanoparticles (Au-Pt NPs) has been synthesized via a facile seed-mediated growth method, in which dendritic Pt nanoparticles as shell grow on the surface of gold nanocores by using ascorbic acid (AA) as “green” reducing reagents. The morphologies and compositions of the as-prepared nanocomposites with core-shell structure are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Electrochemical experiments, including cyclic voltammetry (CV) and chronoamperometry (CA) are performed to investigate the electrocatalytic properties of the Au-Pt NPs loaded carbon black composites (Au-Pt NPs/V) towards methanol oxidation in an alkaline solution. It is found that the reduction time of AA could regulate the thickness and amount of Pt on the Au nanocores, which significantly affect catalytic activity of the Au-Pt NPs/V toward methanol oxidation. Au-Pt NPs/V with optimum reduction time 4h exhibit 2.3-times higher electrocatalytic activity than that of a commercial catalyst (Pt/carbon black) and an excellent CO tolerance toward methanol oxidation. This behavior is attributed to large active electrochemical area of the bimetallic nanocomposites and the change in the electronic structure of Pt when Au surface modified with fewer Pt nanoparticles. Highlights Facile and green method was applied to prepare Core-shell Au-Pt NPs. Catalytical activity of Au-Pt/C is 2.3 times larger than that of commercial Pt/C. The performance of Au-Pt NPs/C could simply tuned by regulate AA reduction time. Au-Pt NPs/C show superior CO tolerance in methanol electrooxidation.


  • 주제어

    Core-shell structure .   Au-Pt .   Electrocatalysis .   Methanol oxidation.  

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