HF改性的多壁碳纳米管负载Au纳米粒子对甲醇的电催化氧化  

Au Nano-Particles Supported on HF Modified Multi-Walled Carbon Nanotubes for Electrocatalytic Oxidation of Methanol

作　　者：肖海峰[1,2] 张正富[2] 徐明丽[3] 杨喜昆[1] 江克柱[1] 韩亚梅[2] 

机构地区：[1]昆明理工大学分析测试研究中心,云南昆明650093 [2]昆明理工大学材料科学与工程学院,云南昆明650093 [3]昆明理工大学理学院,云南昆明650093

出　　处：《稀有金属》2012年第6期921-925,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(20863003;51164017);云南省中青年学术技术带头人后备人才培养项目(2007PY01-9)资助

摘　　要：利用HF溶液处理20～40 nm的MWCNTs后,负载光化学还原法合成的Au纳米粒子,获得了HF改性的Au/MWCNTs纳米催化剂。TEM图表明Au纳米粒子平均粒径约为4.5 nm,均匀负载在MWCNTs表面。XPS结果表明Au/MWCNTs表面可能存在Au-F配位键。另外,C,F之间易形成共价键。由于这些化学键的相互作用共同导致C,F,Au三者之间的电子效应,改变了Au的电子结构,从而有利于改善Au的负载效果,提高Au/MWCNTs的电催化活性。电化学测试结果表明Au/MWCNTs纳米催化剂对甲醇具有明显的电催化氧化活性和良好的稳定性。Au nanoparticles synthesized by photochemical method were supported on multi-walled carbon nanotubes（MWCNTs） with the diameters about 20 - 40 nm which treated by HF solution. Then the nanocatalysts of Au/MWCNTs were obtained. TEM images showed that the average diameter of Au nanoparticles was about 4.5 nm and these nanoparticles dispersed on the MWCNTs surface uni- formly. XPS results showed that the surface of Au/MWCNTs had the coordinate bonds Au-F. In addition, the covalence bonds were easily formed between C and F. The mutual interaction of these chemical bonds led to the electrical effects between the C, F and Au and made the change of electronic structure of Au, which enhanced the loading effect of Au nanoparticles and improved the electrocatalytic activity of Au/MWCNTs. The results of electrochemical measurements showed that the nanocatalysts of Au/MWCNTs had obvious electroanalytic activity and good stability to electrocatalytic oxidation of methanol.

关 键 词：HF功能化处理 多壁碳纳米管 Au MWCNTs纳米催化剂 碱性介质 甲醇 

分 类 号：TQ426.81[化学工程]