高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

SnO2-TiO2薄膜载体对Au-Pt纳米颗粒电化学性能的影响

于志辉, 谢佳, 夏定国   

  1. 北京工业大学环境与能源工程学院, 北京 100124
  • 收稿日期:2007-11-12 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10
  • 通讯作者: 夏定国

Effect of SnO2-TiO2 Film Support on Electrocatalytic Properties of Au-Pt Nanoparticles

YU Zhi-Hui, XIE Jia, XIA Ding-Guo*   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2007-11-12 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10
  • Contact: XIA Ding-Guo

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摘要： 采用真空镀膜法在玻碳(GC)电极表面修饰SnO2-TiO2薄膜, 在SnO2-TiO2/GC复合电极表面组装Au-Pt双金属纳米颗粒, 制得Au-Pt/SnO2-TiO2/GC复合电极. 通过循环伏安法(CV)研究了SnO2-TiO2薄膜载体对Au-Pt双金属纳米颗粒电化学性能的影响; 采用扫描电镜(SEM)及X射线光电子能谱(XPS)对Au-Pt在SnO2-TiO2薄膜沉积的形貌及结构进行了表征. 研究结果表明, 10 nm的Au-Pt双金属纳米颗粒均匀地组装于SnO2-TiO2薄膜表面; SnO2-TiO2薄膜载体改善了复合电极抗CO中毒能力; Au-Pt双金属合金的形成提高了Pt 对甲醇氧化的电催化能力, SnO2-TiO2薄膜载体又使Pt纳米粒子d空轨道增多, 提高了Au-Pt双金属纳米颗粒的稳定性和催化性能.

关键词: Au-Pt纳米颗粒, SnO2-TiO2薄膜, 抗CO中毒, 甲醇氧化

Abstract: SnO2-TiO2 thin films were deposited on the activated glassy carbon electrodes by vacuum coating method. Au-Pt/SnO2-TiO2/GC composite electrode was prepared by reducing HAuCl4 and H2PtCl6 mixture solution and sediment Au-Pt bimetallic nanoparticles successively on the SnO2-TiO2/GC.The effect of SnO2-TiO2 film support on the electrocatalytic properties of Au-Pt nanoparticles was characterized via cyclic voltograme method. The morphological and structural properties of Au-Pt nanoparticles self-assembled on SnO2-TiO2 film were characterized via Scanning Electron Microscope and X-ray Photoelectron Spectroscopy. The results show that the compact and uniformed 10 nm Au-Pt nanoparticles were self-assembled on SnO2-TiO2 film. The ability of anti-CO poisoning was enhanced with the function of SnO2-TiO2 support. The form of Au-Pt alloy enhanced the electrocatalytic oxidation of methanol in acidic system. Furthermore, the increase of d vacancy with the function of SnO2-TiO2 support improved the stability and catalytic property of Au-Pt bimetallic nanoparticles.

Key words: Au-Pt nanoparticles, SnO2-TiO2 film, Anti-CO poisoning, Oxidation of methanol

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