物理化学学报 >> 2007, Vol. 23 >> Issue (07): 993-996.doi: 10.3866/PKU.WHXB20070706

研究论文 上一篇    下一篇

甲醇在Pd基电催化剂上的氧化

郑海涛; 李永亮; 梁剑莹; 沈培康   

  1. 中山大学化学与化工学院材料研究所, 广州 510275; 中山大学物理科学与工程技术学院, 光电材料与技术国家重点实验室, 广州 510275
  • 收稿日期:2007-01-31 修回日期:2007-03-19 发布日期:2007-07-03
  • 通讯作者: 沈培康 E-mail:stsspk@mail.sysu.edu.cn

Methanol Oxidation on Pd-based Electrocatalysts

ZHENG Hai-Tao; LI Yong-Liang; LIANG Jian-Ying; SHEN Pei-Kang   

  1. Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China; State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
  • Received:2007-01-31 Revised:2007-03-19 Published:2007-07-03
  • Contact: SHEN Pei-Kang E-mail:stsspk@mail.sysu.edu.cn

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摘要： 以多壁碳纳米管(MWCNT)和碳黑为载体, 用交替微波加热的方法制备了担载型Pd电催化剂, 并表征了其微观形貌和电化学性能. 透射电镜(TEM)和X射线衍射(XRD)结果显示, Pd在MWCNT载体上有较好的分散度, 平均粒径为4 nm. 循环伏安、计时电位和交流阻抗的测试结果表明, 在碱性溶液中, Pd/MWCNT显示出良好的甲醇氧化性能. 在Pd/MWCNT催化剂上, 甲醇氧化的起始电位比在Pt/C上负移100 mV 左右. Pd/MWCNT高的催化活性不仅与它的高的活性表面积有关, 而且和Pd与载体MWCNT之间的协同作用有关.

关键词: 甲醇氧化, 碳纳米管, Pd/MWCNT, 电催化剂, 燃料电池

Abstract:

Pd nanoparticles were supported on different types of carbon materials including multiwalled carbon nanotubes (MWCNT) and carbon black prepared by the intermittent microwave heating (IMH) technique. The morphologies and electrochemical properties of the electrocatalysts were characterized. TEMand XRD measurements revealed that the Pd nanoparticles were uniformly dispersed on MWCNT with an average particle size of 4 nm. The cyclic voltammetric, chronopotentiometric, and electrochemical impedance spectroscopic (EIS) experiments indicated that Pd/MWCNT electrocatalyst showed a better performance for methanol oxidation than that of Pt/C in alkaline media. A negative shift over 100 mV of the onset potential for methanol oxidation was found on Pd/MWCNT compared to that on Pt/C. The results indicated that the enhancement in the activity for methanol oxidation on Pd/MWCNT was due to not only the increase in the active surface area but also the synergistic interaction between Pd and MWCNT.

Key words: Methanol oxidation, Carbon nanotube, Pd/MWCNT, Electrocatalyst, Fuel cell