SnO_2-TiO_2薄膜载体对Au-Pt纳米颗粒电化学性能的影响  

Effect of SnO_2-TiO_2 Film Support on Electrocatalytic Properties of Au-Pt Nanoparticles

作　　者：于志辉[1] 谢佳[1] 夏定国[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《高等学校化学学报》2008年第6期1190-1194,共5页Chemical Journal of Chinese Universities

基　　金：国家'九七三'计划(批准号:2002CB211807);北京市自然科学基金(批准号:2051001);北京市人才强教-拔尖创新人才项目(06拔尖创新人才)资助

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,10nm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.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 vohograme 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 resuhs 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.

关 键 词：Au-Pt纳米颗粒 SnO2-TiO2薄膜 抗CO中毒 甲醇氧化 

分 类 号：O646[理学—物理化学]