物理化学学报 >> 1997, Vol. 13 >> Issue (07): 632-636.doi: 10.3866/PKU.WHXB19970711

研究论文 上一篇    下一篇

铂单晶电极表面不可逆反应动力学I.Pt(100)单晶电极上甲酸氧化的现场红外反射光谱研究

杨毅芸,孙世刚   

  1. 厦门大学固体表面物理化学国家重点实验室,化学系,物理化学研究所,厦门 361005
  • 收稿日期:1996-11-15 修回日期:1997-03-19 发布日期:1997-07-15
  • 通讯作者: 孙世刚

Kinetics of Irreversible Reactions on Platinum Single Crystal Electrodes

Yang Yi-Yun,Sun Shi-Gang   

  1. State Key Laboratory for Physical Chemistry of the Solid Surface,Department of Chemistry,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
  • Received:1996-11-15 Revised:1997-03-19 Published:1997-07-15
  • Contact: Sun Shi-Gang

摘要:

运用电化学暂态方法和现场时间分辨FTIR反射光谱研究甲酸在Pt(100)单晶电极上的解离吸附和氧化过程.深入认识了甲酸解离吸附的反应速率在-0.25至0.25V电位区间呈火山形变化的规律.根据电化学现场时间分辨红外光谱的研究结果,提出在研究反应动力学时避免甲酸解离吸附干扰的方法,为进一步研究甲酸在Pt(100)电极表面经活性中间体直接氧化至CO2的反应动力学奠定了基础.

关键词: 铂单晶电极, 甲酸, 不可逆反应动力学, 现场红外反射光谱

Abstract:

The dissociative adsorption and oxidation of formic acid on Pt(100) single crystal electrode were investigated by using electrochemical techniques and in situ time resolved FTIR spectroscopy (TR-FTIRS). The results demonstrated that the distribution of the rate of dissociative adsorption of HCOOH on Pt(100) versus electrode potential yields a volcanic relationship between -0.25 and 0.25 V. Based on results of TR-FTIRS, we concluded that the dissociative adsorption of HCOOH on Pt(100) can be avoided by designing appropriate potential step program, which is the basis of further studies of the kinetics of direct oxidation of HCOOH into CO2 via reactive intermediates.

Key words: Platinum single cryatal electrodes, Formic acid, Kinetics of irreversible reaction, in situ FTIR spectroscopy