化学学报 ›› 2007, Vol. 65 ›› Issue (16): 1583-1587. 上一篇    下一篇

研究论文

碳黑预处理对Pt/C催化剂对甲醇氧化电催化活性的影响

吕艳卓*,1, 徐岩2, 陆天虹3,4, 邢巍3, 张密林1   

  1. (1哈尔滨工程大学材料科学与化学工程学院 哈尔滨 150001)
    (2哈尔滨工程大学工程训练中心 哈尔滨 150001)
    (3中国科学院长春应用化学研究所 长春 130022)
    (4南京师范大学化学与环境科学学院 南京 210097)
  • 收稿日期:2006-10-08 修回日期:2007-06-18 出版日期:2007-08-28 发布日期:2007-08-28
  • 通讯作者: 吕艳卓

Effect of Pretreatment of Black Carbon on Electrocatalytic Activity of Pt/C Catalyst for Methanol Oxidation

LÜ Yan-Zhuo*,1; XU Yan2; LU Tian-Hong3,4; XING Wei3; ZHANG Mi-Lin1   

  1. (1 College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001)
    (2 Engineering Training Center, Harbin Engineering University, Harbin 150001)
    (3 Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022)
    (4 College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097)
  • Received:2006-10-08 Revised:2007-06-18 Online:2007-08-28 Published:2007-08-28
  • Contact: LÜ Yan-Zhuo

直接甲醇燃料电池(DMFC)由于具有较多的优点而受到广泛的关注. 但是碳载Pt (Pt/C)阳极催化剂电催化活性低是限制其应用的一个主要问题. 为了提高Pt/C催化剂对甲醇氧化的电催化性能, 分别用CO2, 空气, H2O2或HNO3对常用作为载体的Vulcan XC-72碳黑进行预处理. 结果表明, 在用CO2, 空气, HNO3, H2O2处理的及未处理的碳黑作载体制得的Pt/C催化剂电极上, 甲醇氧化峰的峰电流密度顺序为39, 33, 32, 20和18 mA•cm-2, 表明用CO2处理的碳载体制备的Pt/C催化剂对甲醇氧化有最好的电催化活性和稳定性. 其主要原因是用CO2处理能减少碳黑表面的含氧基团和增加石墨化程度, 而使碳黑的电阻降低及Pt粒子在碳黑上的分散性变好.

关键词: 直接甲醇燃料电池, 甲醇氧化, 碳黑, 预处理

Direct methanol fuel cell (DMFC) has attracted wide attention due to its many advantages. However, its practical application is limited by the low electrocatalytic activity of the anodic Pt/C catalyst usually used for the methanol oxidation. In this paper, in order to increase the electrocatalytic performance of the Pt/C catalyst for the methanol oxidation, the black carbon, usually used as the supporter, was pretreated with CO2, air, HNO3 or H2O2. The cyclic voltammetric results indicated that the current densities of the anodic peak of methanol oxidation at the Pt/C catalysts with the black carbon pretreated with CO2, air, HNO3, H2O2 and untreated black carbon were 39, 33, 32, 20 and 18 mA•cm-2, respectively, illustrating that among the above five kinds of the Pt/C catalysts, the Pt/C catalyst with the black carbon pretreated with CO2 shows the best electrocatalytic activity and stability for the methanol oxidation. Its main reason is that the CO2 pretreatment could reduce the content of the oxygen-containing groups on the surface of the black carbon and increase the content of graphite in the black carbon, leading to the low resistance of the black carbon and the increase in the dispersion extent of the Pt particles in the Pt/C catalyst.

Key words: direct methanol fuel cell, methanol oxidation, black carbon, pretreatment