物理化学学报 >> 2012, Vol. 28 >> Issue (04): 871-876.doi: 10.3866/PKU.WHXB201202013

电化学和新能源 上一篇    下一篇

高催化活性Pd-Co3O4/MWCNTs催化剂对甲醇氧化的电催化性能

聂素连, 赵彦春, 范杰文, 田建袅, 宁珍, 李笑笑   

  1. 广西师范大学化学化工学院, 药用资源化学与药物分子工程教育部重点实验室, 广西桂林 541004
  • 收稿日期:2011-10-19 修回日期:2012-01-10 发布日期:2012-03-21
  • 通讯作者: 赵彦春 E-mail:yanchunzh@yahoo.cn
  • 基金资助:

    广西自然科学基金(2010GXNSFF013001, 0728043)和国家自然科学基金(21163002)资助项目

Highly Active Pd-Co3O4/MWCNTs Catalysts for Methanol Electrocatalytic Oxidation

NIE Su-Lian, ZHAO Yan-Chun, FAN Jie-Wen, TIAN Jian-Niao, NING Zhen, LI Xiao-Xiao   

  1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Education of China, College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, Guangxi Province, P. R. China
  • Received:2011-10-19 Revised:2012-01-10 Published:2012-03-21
  • Contact: ZHAO Yan-Chun E-mail:yanchunzh@yahoo.cn
  • Supported by:

    The project was supported by the Guangxi Natural Science Foundation, China (2010GXNSFF013001, 0728043) and National Natural Science Foundation of China (21163002).

摘要: 以Co(NO3)3·6H2O为钴源, 聚乙二醇(PEG) 20000 为表面活性剂, 与多壁碳纳米管(MWCNTs)混合后通过水热氧化法成功地合成了表面均匀分布纳米絮状Co3O4的MWCNTs 复合物, 进一步还原Pd的前驱体而制备得到Pd-Co3O4/MWCNTs 复合催化剂. 利用扫描电镜(SEM)、透射电镜(TEM)及X射线粉末衍射(XRD)等手段对样品的形貌和晶型结构进行了表征, 结果表明Pd纳米粒子为面心立方晶体结构, 均匀地分布在Co3O4修饰的MWCNTs 表面. 用循环伏安法和计时电流法表征结果表明: 催化剂Pd-Co3O4/MWCNTs 具有较大的电化学活性表面积, 在碱性介质中对甲醇氧化具有更高的电催化活性和稳定性. 研究结果表明, 过渡金属氧化物纳米Co3O4颗粒在提高直接甲醇燃料电池(DMFC)催化性能研究中具有十分重要的作用, 是一类很有潜力的载体催化剂.

关键词: 直接甲醇燃料电池, Co3O4, 水热氧化法, Pd, 多壁碳纳米管, 电催化氧化

Abstract: Nano-flocculent-Co3O4 modified multi-walled carbon nanotubes supported Pd nanoparticles (Pd-Co3O4/MWCNTs) with uniform dimensions were prepared by a facile hydrothermal method using Co(NO3)3·6H2O as the cobalt source, polyethylene glycol (PEG) 20000 as a surface active agent, and H2PdCl4 as the Pd precursor. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray powder diffraction. The Pd nanoparticles had a face-centered cubic crystal structure and were well dispersed on the external walls of the Co3O4/MWCNTs. The catalytic activity was studied by cyclic voltammetry and chronoamperometry toward methanol oxidation. The Pd-Co3O4/MWCNT catalysts had a large electrochemically active area, good electrocatalytic performance, and stability toward methanol oxidation in alkaline media. All the results suggest that Co3O4 will improve the electrocatalytic activity in direct methanol fuel cells.

Key words: Direct methanol fuel cell, Co3O4, Hydrothermal method, Pd, Multi-walled carbon nanotubes, Electrocatalytic oxidation

MSC2000: 

  • O646