物理化学学报 >> 2009, Vol. 25 >> Issue (04): 719-723.doi: 10.3866/PKU.WHXB20090425

研究论文 上一篇    下一篇

抗CO中毒的Pt-HxWO3电沉积制备及其对甲醇氧化的催化作用

杨红艳 郭盼盼 李伟善   

  1. 华南师范大学化学与环境学院, 广州 510006; 广东高校电化学储能与发电技术重点实验室, 广州 510006
  • 收稿日期:2008-10-20 修回日期:2009-01-19 发布日期:2009-03-31
  • 通讯作者: 李伟善 E-mail:liwsh@scnu.edu.cn

Electrodeposition Preparation and Activity of CO-Resistant Catalyst Pt-HxWO3 for Methanol Oxidation

 YANG Hong-Yan, GUO Pan-Pan, LI Wei-Shan   

  1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China; Key Laboratory of Electrochemical Technology on Energy Storage and Power Generation in Guangdong Universities, Guangzhou 510006, P. R. China
  • Received:2008-10-20 Revised:2009-01-19 Published:2009-03-31
  • Contact: LI Wei-Shan E-mail:liwsh@scnu.edu.cn

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摘要：

用循环伏安法在玻碳电极上制备出铂-氢钨青铜(Pt-HxWO3)催化剂, 用扫描电子显微镜(SEM)、Raman光谱和循环伏安法研究了催化剂的组成、结构及其对甲醇氧化的催化作用. 结果表明, Pt-HxWO3的活性与制备溶液中铂与钨原子比及酸度有关, 与相同条件下制备的纯铂(Pt)催化剂相比, Pt-HxWO3对甲醇的氧化有更强的催化活性. 当制备溶液中铂和钨的原子比为1:8时, 得到的催化剂Pt-HxWO3中铂与钨原子比为4:1, 其催化活性最佳, 甲醇氧化电流是Pt作为催化剂时的1.7倍. Pt-HxWO3的强催化活性归因于其抗CO中毒能力, CO在Pt-HxWO3上氧化起始电位提前了50 mV.

关键词: 电沉积, 铂, 氢钨青铜, 甲醇氧化, 一氧化碳

Abstract:

Platinum-hydrogen tungsten bronze (Pt-HxWO3) was prepared on a glassy carbon electrode by cyclic
voltammetry and its composition, morphology, structure, and activity towards methanol oxidation were characterized by scanning electron microscope (SEM), Raman spectrum, and cyclic voltammetry. Results show that Pt-HxWO3 has better activity toward methanol oxidation than pure platinum(Pt) prepared under the same conditions. When the atomic ratio of Pt toWin the solution for the Pt-HxWO3 preparation is 1:8, the atomic ratio of Pt toWin the prepared Pt-HxWO3 is 4:1. This catalyst has the best activity for methanol oxidation. The peak current for methanol oxidation on this catalyst is 1.7 times that on Pt. The better catalytic activity of Pt-HxWO3 results from its better resistance to toxic CO than Pt because the CO oxidation on Pt-HxWO3 is 50 mV more negative than the case on Pt.

Key words: Electrodeposition, Platinum, Hydrogen tungsten bronze, Methanol oxidation, CO

MSC2000: 

  • O643