物理化学学报 >> 2004, Vol. 20 >> Issue (09): 1108-1111.doi: 10.3866/PKU.WHXB20040910

研究论文 上一篇    下一篇

Ho3＋对吸附CO电化学氧化的促进作用

高颖;邬冰;万丽娟;刘长鹏;邢巍;陆天虹   

  1. 中国科学院长春应用化学研究所,长春　130022;哈尔滨师范大学化学系,哈尔滨　150080; 南京师范大学化学与环境科学学院,南京　210097
  • 收稿日期:2004-01-19 修回日期:2004-05-10 发布日期:2004-09-15
  • 通讯作者: 陆天虹 E-mail:tianhonglu@263.net

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

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摘要： 研究了吸附在Pt/C催化剂上的Ho3＋对吸附CO的电氧化的影响.结果表明,无论在中性和酸性溶液中,在较大的温度范围内,Ho3＋对CO在Pt/C催化剂上的电氧化都有促进作用,其原因是吸附Ho3＋的存在减弱了CO在Pt/C催化剂上的吸附强度.其次,在中性溶液中,Ho3＋对吸附CO的电氧化的促进作用比在酸性溶液中大.第三,无论在酸性还是中性溶液中,温度的升高有利于发挥Ho3＋对吸附CO的电氧化的促进作用.

关键词: CO, Ho3＋, Pt, 电氧化

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