Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (06): 616-620.doi: 10.3866/PKU.WHXB20040613

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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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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