SnO2-TiO2薄膜载体对Au-Pt纳米颗粒电化学性能的影响

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.

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

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.