物理化学学报 >> 2013, Vol. 29 >> Issue (02): 287-292.doi: 10.3866/PKU.WHXB201211261

电化学和新能源 上一篇    下一篇

纳米三氧化钨修饰碳纳米管载铂催化剂对甲醇氧化的电催化性能

周阳1,2, 褚有群1, 刘委明1, 马淳安1   

  1. 1 浙江工业大学化工材料学院, 绿色化学合成技术国家重点实验室培育基地, 科技部能源材料及应用国际科技合作基地, 杭州 310032;
    2 江西理工大学冶金与化学工程学院, 江西 赣州 341000
  • 收稿日期:2012-08-02 修回日期:2012-11-23 发布日期:2013-01-14
  • 通讯作者: 马淳安 E-mail:science@zjut.edu.cn
  • 基金资助:

    科技部国际科技合作重大专项(2010DFB63680), 浙江省教育厅科研项目(Y201225711) 和浙江省自然科学基金重点项目(Z4100790)资助

Nano-WO3 Modified Carbon Nanotube Supported Pt and Their Electrocatalytic Activity for Methanol Electro-Oxidation

ZHOU Yang1,2, CHU You-Qun1, LIU Wei-Ming1, MA Chun-An1   

  1. 1 State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, International Science&Technology Cooperation Base of Energy Materials and Application, College Of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China;
    2 Jiangxi University of Science and Technology, Metallurgical and Chemical Engineering Institute. Ganzhou 341000, Jiangxi Province, P. R. China
  • Received:2012-08-02 Revised:2012-11-23 Published:2013-01-14
  • Supported by:

    The project was supported by the International Science and Technology Cooperation Program of China (2010DFB63680), Research Project of Ministry of Education of Zhejiang Province, China (Y201225711), and Key Project of National Science Foundation of Zhejiang Province, China (Z4100790).

摘要:

采用表面修饰技术将碳纳米管(CNT)表面羧基化, 通过羧基将钨离子基团修饰到碳纳米管的外表面, 再通过高温焙烧处理将钨离子基团氧化成WO3, 成功合成了纳米WO3/CNT复合物, 进一步还原Pt 的前驱体而得到Pt-WO3/CNT复合催化剂. 采用X射线粉末衍射(XRD)和透射电镜(TEM)对样品的形貌和晶型结构进行了表征, 结果表明, Pt纳米粒子为面心立方晶体结构, 均匀地分布在WO3修饰的碳纳米管表面. 采用循环伏安(CV)和计时电流法研究了在酸性溶液中Pt-WO3/CNT催化剂对甲醇的电催化氧化活性, 结果表明WO3修饰的碳纳米管载铂催化剂比用混酸处理的碳纳米管载铂催化剂对甲醇呈现出更高的电催化氧化活性和更好的稳定性.

关键词: 直接甲醇燃料电池, 碳纳米管, 三氧化钨, 电催化

Abstract:

Nano-WO3-modified carbon nanotube supported Pt nanoparticles (Pt-WO3/CNT) with uniform dimensions were prepared by adsorption and decomposition of ammonium meta-tungstate (AMT) on the surface of CNTs pretreated with HNO3, and H2PtCl6 as the Pt precursor. The samples were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The Pt nanoparticles had a face-centered cubic crystal structure, and were well dispersed on the external walls and ports of the WO3/ CNTs. The electrocatalytic activity of the samples towards the oxidation of methanol was investigated using cyclic voltammetry and chronoamperometry. The results indicated that the Pt-WO3/CNT catalysts exhibited higher electrocatalytic activity, better anti-poisoning ability, and good stability during methanol oxidation compared with Pt/CNTs used for acid oxidation treatments.

Key words: Direct methanol fuel cell, Carbon nanotube, Tungsten trioxide, Electro-catalysis

MSC2000: 

  • O646