化工学报 ›› 2010, Vol. 61 ›› Issue (S1): 96-100.

• 能源和环境工程 • 上一篇    下一篇

铂修饰聚吡咯电极电催化氧化甲醇的CO毒化特性

朱婉霞,汪伍洋,李美超,莫卫民   

  1. 浙江工业大学化学工程与材料学院,浙江工业大学分析测试中心,绿色化学合成技术国家重点实验室培育基地
  • 出版日期:2010-06-29 发布日期:2010-06-29

CO poisoning properties during methanol electro-oxidation onpolypyrrole modified by platinum

ZHU WanxiaWANG WuyangLI MeichaoMO Weimin   

  • Online:2010-06-29 Published:2010-06-29

摘要:

采用循环伏安法和电化学原位红外光谱技术研究了铂修饰聚吡咯电极(nm-Pt/PPy)对甲醇的电催化氧化反应,结果表明,nm-Pt/PPy对甲醇具有较好的电催化活性,当电位为1000 mV时,可清楚地观察到甲醇经电氧化生成了最终产物CO2。但是在电化学氧化过程中仍存在CO的毒化现象,在低电位下,CO分别以桥式和线性方式吸附,随着电位升高,逐渐变为以线性吸附为主。另外,电氧化电位不宜过高,nm-Pt/PPy的电催化活性易因聚吡咯过氧化而降低。

关键词: FONT-FAMILY: 宋体, mso-bidi-font-size: 12.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Times New Roman">铂;甲醇;原位红外光谱;聚吡咯

Abstract:

Cyclic voltammetry and in situ electrochemical FTIR spectroscopy techniques have been combined to study the methanol electro-oxidation on polypyrrole modified by platinumnm-Pt/PPy.The nm-Pt/PPy shows good electrocatalytic activity for methanol electro-oxidationand the final product CO2 can be observed at 1000mV.HoweverCO poisoning of Pt particles cant be avoided despite the presence of polypyrrole film.At low potentialsthe linearly absorbed CO and the bridge-bonded CO form on the nm-Pt/PPyrespectively.With the potential increasingthere is only the linearly absorbed CO.At high potentialsthe PPy is overoxidized and the electrocatalytic activity of nm-Pt/PPy is decreased.

Key words: FONT-FAMILY: 宋体, mso-bidi-font-size: 12.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Times New Roman">铂;甲醇;原位红外光谱;聚吡咯