物理化学学报 >> 2004, Vol. 20 >> Issue (06): 616-620.doi: 10.3866/PKU.WHXB20040613

研究论文 上一篇    下一篇

Eu3＋和Ho3＋对乙醇在Pt-TiO2/C电极上氧化的助催化作用

万丽娟;高颖;邬冰;刘长鹏;邢巍;陆天虹   

  1. 哈尔滨师范大学理化学院,哈尔滨　150080;中国科学院长春应用化学研究所,长春　130022;南京师范大学化学与环境科学学院,南京　210097
  • 收稿日期:2003-11-12 修回日期:2004-03-01 发布日期:2004-06-15
  • 通讯作者: 高颖 E-mail:yinggao99@sohu.com

Cocatalysis of Adsorbed Eu3＋ and Ho3＋ at Pt-TiO2/C Electrode for Electrooxidaton of Ethanol

Wan Li-Juan;Gao Ying;Wu Bing;Liu Chang-Peng;Xing Wei;Lu Tian-Hong   

  1. College of Physical and Chemistry, Harbin Normal University,Harbin　150080; 　2Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun　130022;College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing　210097
  • Received:2003-11-12 Revised:2004-03-01 Published:2004-06-15
  • Contact: Gao Ying E-mail:yinggao99@sohu.com

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摘要： 报道了用循环伏安法研究Eu3＋和Ho3＋吸附的碳载Pt-TiO2(Pt-TiO2/C)催化剂对乙醇电化学氧化的助催化作用.发现无论在中性溶液中还是在酸性溶液中,当Pt-TiO2/C催化剂吸附Eu3＋或Ho3＋后,都可以使乙醇的电催化氧化电流密度明显增加,其原因主要是Eu3＋或Ho3＋都能促进吸附的CO的电氧化.

关键词: 燃料电池, 乙醇, 电催化氧化, 铕, 钬

Abstract: The cocatalysis of adsorbed Eu3＋ or Ho3＋ for the ethanol electrooxidation at Pt-TiO2/C electrode was investigated with the cyclic voltammetric technique. It was found that the electrocatalytic activities of the Pt-TiO2-Ho3＋/C and Pt-TiO2-Eu3＋/C electrodes are better than that of the Pt-TiO2/C electrode both in acidic and neutral solutions. It can be explained as follows. When ethanol is electrooxidized, the intermediates, such as CO and COH can be formed. These species would be strongly adsorbed on the Pt surface and decrease the electrocatalytic activity for the ethanol oxidation. Both Eu3＋ and Ho3＋ can strongly coordinate with H2O, forming OH species, which can accelerate the electrooxidation of the strongly adsorbed CO. Therefore, Both Eu3＋ and Ho3＋ show the promoting action for the electrooxidation of ethanol.

Key words: Fuel cell, Ethanol, Electrocatalytic oxidation, Europium, Holmium