物理化学学报 >> 2004, Vol. 20 >> Issue (04): 382-385.doi: 10.3866/PKU.WHXB20040410

研究论文 上一篇    下一篇

Pt(111)单晶电极上乙二醇解离吸附反应动力学

樊友军;范纯洁;甄春花;陈声培;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,厦门 361005
  • 收稿日期:2003-10-06 修回日期:2003-12-09 发布日期:2004-04-15
  • 通讯作者: 孙世刚 E-mail:sgsun@xmu.edu.cn

Kinetics of Dissociative Adsorption of Ethylene Glycol on Pt(111) Electrode

Fan You-Jun;Fan Chun-Jie;Zhen Chun-Hua;Chen Sheng-Pei;Sun Shi-Gang   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2003-10-06 Revised:2003-12-09 Published:2004-04-15
  • Contact: Sun Shi-Gang E-mail:sgsun@xmu.edu.cn

摘要: 运用电化学循环伏安和程序电位阶跃方法研究了乙二醇在Pt(111)单晶电极上的解离吸附过程.动力学研究的定量结果指出,乙二醇解离吸附反应的平均速率随电极电位变化呈火山型分布,其最大值在0.10 V(vs SCE)附近.测得在含2×10-3 mol•L-1乙二醇的溶液中,最大初始解离速率vi为4.35×10-12 mol•cm--2•s-1.

关键词: 乙二醇, 解离吸附, Pt(111)电极, 表面反应动力学, 程序电位阶跃

Abstract: The dissociative adsorption of ethylene glycol (EG) on Pt(111) electrode has been investigated with electrochemical cyclic voltammetry and programmed potential step technique. The quantitative results demonstrated that the average rate of dissociative adsorption of ethylene glycol on Pt(111) electrode depends on electrode potentials, yielding a distribution of volcanic shape on adsorption potentials between -0.20 and 0.35 V with the maximum value of 3.90×10-12 mol•cm-2•s-1 located near 0.10 V(vs SCE).From the variation of the quantity of dissociative adsorbates determined through the oxidation charge with adsorption time (tad), the initial rate (vi) of this surface reaction has been evaluated quantitatively. The maximum of vi was ascertained to be 4.35×10-12 mol•cm-2•s-1 at 0.10 V for a solution containing 2×10-3 mol•L-1 EG.

Key words: Ethylene glycol, Dissociative adsorption, Pt(111) electrode, Surface reaction kinetics, Programmed potential step technique