Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (09): 1108-1111.doi: 10.3866/PKU.WHXB20040910

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Promotion of Electrooxidation of Adsorbed CO by Ho3+

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

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;Department of Chemistry, Harbin Normal University, Harbin 150080;Department of Chemistry, Nanjing Normal University, Nanjing 210097
  • Received:2004-01-19 Revised:2004-05-10 Published:2004-09-15
  • Contact: Lu Tian-Hong E-mail:tianhonglu@263.net

Abstract: The effect of Ho3+ adsorbed on the Pt/C catalyst on the electrooxidation of the adsorbed CO was studied. It was found that Ho3+ adsorbed on the Pt/C catalyst could promote the electrooxidation of the adsorbed CO in both neutral and acidic solutions in a large temperature range. Firstly, it is due to that Ho3+ could reduce the adsorption intensity of CO. Secondly, Eox and Ep of CO adsorbed on the Pt-Ho3+/C catalyst in the neutral solution are more negative than that in the acidic solution, indicating that the promoting effect of Ho3+ in the neutral solution is larger than that in the acidic solution. Thirdly, in both neutral and acidic solutions, the negative shift of Eox and Ep of CO adsorbed on the Pt-Ho3+/C catalyst increases with increase of the temperature. Thus, the increase in the temperature promotes the action of Ho3+. When the temperature is at 60 ℃,the negative shift of Eox and Ep of CO adsorbed on the Pt-Ho3+/C catalyst is sufficient to avoid poisoning of Pt catalyst by CO. In addition, Pt-Ho3+/C catalyst is easy to be prepared. Thus, it is possible to apply the Pt-Ho3+/C catalyst in PEMFC (proton exchange membrane fuel cell) and DMFC(direct methanol fuel cell).

Key words: CO, Ho3+, Pt, Electrooxidation