物理化学学报 >> 2005, Vol. 21 >> Issue (11): 1280-1284.doi: 10.3866/PKU.WHXB20051117

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碱性介质中异丙醇在铂电极表面的吸附和电化学氧化

林珩; 陈国良; 郑子山; 周建章; 陈声培; 林仲华   

  1. 漳州师范学院化学系，福建 漳州 363000; 厦门大学化学化工学院，固体表面物理化学国家重点实验室，厦门 361005
  • 收稿日期:2005-04-20 修回日期:2005-06-22 发布日期:2005-11-15
  • 通讯作者: 林珩 E-mail:cheng1259@263.net

The Adsorption and Oxidation of Isopropanol at Platinum Electrode in Alkaline Media

LIN Heng; CHEN Guo-liang; ZHENG Zi-shan; ZHOU Jian-zhang; CHEN Sheng-pei; LIN Zhong-hua   

  1. Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000； State Key Laboratory of Physical Chemistry of the Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005
  • Received:2005-04-20 Revised:2005-06-22 Published:2005-11-15
  • Contact: LIN Heng E-mail:cheng1259@263.net

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摘要： 运用电化学循环伏安、原位FTIR反射光谱和石英晶体微天平(EQCM)等方法研究了碱性介质中异丙醇在Pt电极表面吸附和氧化行为. 结果表明：碱性介质中异丙醇电氧化过程不存在自毒化现象. 虽然电化学原位FTIR反射光谱未能检测到CO等毒性物种, 但EQCM结果证明异丙醇或其解离产物吸附于铂电极上. 在实验条件下, 碱性介质中异丙醇在铂电极上氧化的最终产物只有丙酮, 预示着碱性介质中异丙醇通过脱氢步骤氧化成丙酮. EQCM研究还从电极表面质量定量变化的角度提供了异丙醇吸附和电氧化反应机理的新数据.

关键词: Pt电极, 电氧化, 异丙醇, 原位FTIR, EQCM, 碱性介质

Abstract: The adsorption and oxidation of isopropanol in alkaline media at platinum electrode have been investigated by using electrochemical quartz crystal microbalance (EQCM) and in situ FTIR spectroscopy. The results show that there is no self-poisoning in the electrooxidation of isopropanol in alkaline media. Though no poison species, such as CO, are evidenced by in situ FTIR spectroscopy, the adsorption of isopropanol or its dissociative products on Pt surface is suggested by EQCM data. The final product of isopropanol oxidation is only acetone under experimental condition, which suggests that the oxidation of isopropanol into acetone takes place via dehydrogenation step. The EQCM studies provide quantitative results of surface mass variation and have thrown new light in the elucidating isopropanol oxidation.

Key words: Pt electrode, Electrooxidation, Isopropanol, In situ FTIR, EQCM, Alkaline media