高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (1): 134.

• 研究论文 • 上一篇    下一篇

大孔碳载Ir催化剂对氧还原的电催化性能和抗甲酸能力

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:2010-04-15 修回日期:2010-08-25 出版日期:2011-01-10 发布日期:2010-12-11
  • 通讯作者: 陆天虹 E-mail:tianhonglu@263.net
  • 基金资助:

    国家“八六三”计划项目(批准号:  2007AA05Z143,   2007AA05Z159)和国家自然科学基金(批准号:  20873065, 21073094)资助.

Electrocatalytic Performance and Formic Acid Tolerance Ability of Macropore Carbon Supported Ir Catalyst for Oxygen Reduction

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, China;
    2. Research Institute of Chemical Defense, Beijing 100191, China;
    3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China  
  • Received:2010-04-15 Revised:2010-08-25 Online:2011-01-10 Published:2010-12-11
  • Contact: LU Tian-Hong E-mail:tianhonglu@263.net
  • Supported by:

    国家“八六三”计划项目(批准号:  2007AA05Z143,   2007AA05Z159)和国家自然科学基金(批准号:  20873065, 21073094)资助.

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被引次数

11

摘要： 本文用X射线能量色散谱(EDS)、X射线衍射(XRD)谱、拉曼光谱和电化学等技术研究了直接甲酸燃料电池(DFAFC)中Vulcan XC-72炭黑载Ir(Ir/XC)和大孔炭载(Ir/MC)催化剂对氧还原的电催化性能和抗甲酸的能力。发现Ir/MC催化剂对氧还原的电催化性能要优于Ir/XC催化剂，氧起始还原电位比在Ir/XC催化剂上正移0.1V，极限电流密度比在Ir/XC催化剂上大30％左右。由于Ir/MC和Ir/XC催化剂的Ir粒子平均粒径和相对结晶度相似，因此，这只能归结于MC有大的孔径和孔率及高的石墨化程度。另外2种催化剂都有很好的抗甲酸能力。因此MC是一种比XC更好的催化剂的炭载体。

关键词: 直接甲酸燃料电池, 炭载Ir催化剂, 大孔碳, 氧还原

Abstract: In this paper, the electrocatalytic performance and formic acid tolerance ability of the Vulcan XC-72 carbon black supported Ir (Ir/XC) catalyst and the macropore carbon supported Ir (Ir/MC) catalyst in the direct formic acid fuel cell were investigated using the energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) spectroscopy, Raman spectroscopy and electrochemical technique. It was found that the electrocatalytic performance of the Ir/MC catalyst for the oxygen reduction is better than that of the Ir/XC catalyst. The onset reduction potential of oxygen at the Ir/MC catalyst is 0.1 V more positive than that at the Ir/XC catalyst. The limiting current density of the oxygen reduction at the Ir/C catalyst is 30% larger than that at the Ir/XC catalyst. This could be only attributed to the large pore diameter and porosity as well as high graphitization extent because the average diameters and relative crystallinity of two catalysts are similar. In addition, both catalysts have the good formic acid tolerance. Therefore, MC is a carbon carrier of the catalyst better than XC.

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