物理化学学报 >> 2011, Vol. 27 >> Issue (03): 604-608.doi: 10.3866/PKU.WHXB20110301

电化学和新能源 上一篇    下一篇

大孔炭载Pd催化剂对甲酸氧化的电催化性能

刘春艳1, 徐斌2, 唐亚文1, 曹高萍2, 杨裕生2, 陆天虹1,3   

  1. 1. 南京师范大学化学与环境科学学院, 南京 210097;
    2. 防化研究院, 北京 100191;
    3. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:2010-08-16 修回日期:2010-12-27 发布日期:2011-03-03
  • 通讯作者: 陆天虹 E-mail:tianhonglu@263.net
  • 基金资助:

    国家自然科学基金(20873065, 21073094)资助项目

Electrocatalytic Performance of Pd Catalyst Supported on Macropore Carbon for Oxidation of Formic Acid

LIU Chun-Yan1, XU Bin2, TANG Ya-Wen1, CAO Gao-Ping2, YANG Yu-Sheng2, LU Tian-Hong1,3   

  1. 1. School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, P. R. China;
    2. Research Institute of Chemical Defense, Beijing 100191, P. R. China;
    3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2010-08-16 Revised:2010-12-27 Published:2011-03-03
  • Contact: LU Tian-Hong E-mail:tianhonglu@263.net
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873065, 21073094).

摘要:

用X射线能量色散谱(EDS)、X射线衍射(XRD)谱、拉曼光谱和电化学技术研究和比较了直接甲酸燃料电池(DFAFC)中Vulcan XC-72炭黑载Pd (Pd/XC)和大孔炭载Pd (Pd/MC)催化剂对甲酸氧化的电催化性能. 循环伏安曲线测量表明甲酸在Pd/XC和Pd/MC催化剂电极上主要氧化峰的峰电位基本相同, 在0.15 V左右, 但在Pd/MC催化剂电极上的峰电流密度比在Pd/XC催化剂上的大30%左右. 计时电流曲线测量表明, 在6000 s时, 在Pd/MC催化剂电极上的峰电流密度比在Pd/XC催化剂上的大38%左右, 这些结果说明Pd/MC催化剂对甲酸氧化的电催化活性和稳定性要好于Pd/XC催化剂. 由于Pd/MC和Pd/XC催化剂的Pd粒子平均粒径和相对结晶度相似, 因此, Pd/MC催化剂电催化性能好的原因只能归结于MC大的孔径和高的石墨化程度引起的高电导率.

关键词: 甲酸氧化, 大孔炭, 炭载Pd催化剂, 电催化性能, 直接甲酸燃料电池

Abstract:

The electrocatalytic performances of a Vulcan XC-72 carbon black supported Pd (Pd/XC) catalyst and a macroporous carbon supported Pd (Pd/MC) catalyst for formic acid oxidation in a direct formic acid fuel cell were investigated and compared. This was carried out using X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) spectroscopy, Raman spectroscopy, and electrochemical techniques. The cyclic voltammograms indicate that the main peak potentials for the oxidation of formic acid at the Pd/XC and Pd/MC catalyst electrodes are similar and they are located at about 0.15 V. However, the peak current density of the Pd/MC catalyst electrode is about 30% larger than that of the Pd/XC catalyst electrode. The chronoamperometric curves indicate that the peak current density at the Pd/MC catalyst electrode at 6000 s is about 38% larger than that at the Pd/XC catalyst electrode. These results show that the electrocatalytic activity and stability of the Pd/MC catalyst for the oxidation of formic acid are better than those of the Pd/XC catalyst. Because the average size and relative crystallinity of the Pd particles in the two catalysts are similar, the reason for the better electrocatalytic performance of the Pd/MC catalyst could be only attributed to its larger pore diameter and higher conductivity because of its high extent of MC graphitization.

Key words: Formic acid oxidation, Macropore carbon, Carbon supported Pd catalyst, Electrocatalytic performance, Direct formic acid fuel cell

MSC2000: 

  • O646