Synthesis of core-shell Au@Pt nanoparticles supported on Vulcan XC-72 carbon and their electrocatalytic activities for methanol oxidation

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• 作者：Rongjuan Feng ; Min Li ; Jiaxiang Liu ; ^{ljxpost@263.net} ; ^{liujx@mail.buct.edu.cn} ; ^{liujx889@yahoo.com.cn}
• 关键词：Core&ndash ; shell Au@Pt nanoparticles ; Vulcan XC-72 carbon ; Electrocatalyst ; Methanol oxidation
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2012
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：20 July, 2012
• 卷：406
• 期：Complete
• 页码：6-12
• 文件大小：2008 K

摘要

Au@Pt core-shell nanoparticles were successfully synthesized by successive reduction of HAuCl₄ and H₂PtCl₆ and were then assembled on Vulcan XC-72 carbon surface (noted as Au@Pt/C). The morphology and distribution of Au@Pt nanoparticles were characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) and the corresponding result is that core-shell like structure is observed. The Au@Pt/C catalysts with different Au/Pt atomic ratios were characterized by TEM, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrocatalytic activities of Au@Pt/C catalysts were investigated by cyclic voltammetry (CV) in 1.0 M H₂SO₄ + 1.0 M methanol aqueous solution. The effects of Au/Pt atomic ratio, CV scan rate and methanol concentration on the peak current of methanol oxidation and the long-term cycle stability were also discussed. The results revealed that compared with Au@Pt/C (1:4, 1:1, 2:1) catalysts, Au/C catalyst, and Pt/C catalyst, Au@Pt/C (1:2) catalyst exhibits higher electrocatalytic activity toward methanol oxidation in acidic media, and the peak current density of Au@Pt/C (1:2) catalyst is about 2.5 times as large as that of Pt/C catalyst without Au core. Further more, Au@Pt/C (1:2) catalyst shows good long-term cycle stability and 91.1%value of peak current of methanol oxidation remains after 200 cycles.