物理化学学报 >> 1990, Vol. 6 >> Issue (03): 318-322.doi: 10.3866/PKU.WHXB19900313

研究论文 上一篇    下一篇

Pt电极表面及附近水行为的现场红外反射吸收光谱电化学初探

张久俊; 陆君涛; 查全性; 冯子刚   

  1. 武汉大学化学系；武汉大学分析测试中心
  • 收稿日期:1988-11-22 修回日期:1989-06-09 发布日期:1990-06-15
  • 通讯作者: 张久俊

An In-Situ FTIR Reflection-Absorption Spectroscopic Study of Water on and Near Pt Electrode Surface

Zhang Jiu-Jun; Lu Jun-Tao; Zha Chuan-Sin; Feng Zi-Gang   

  1. Chemistry Department, Wuhan University, Wuhan;Center of Analysis, Wuhan University, Wuhan
  • Received:1988-11-22 Revised:1989-06-09 Published:1990-06-15
  • Contact: Zhang Jiu-Jun

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摘要： 本文用现场红外反射吸收光谱电化学方法和循环伏安法研究了Pt电极表面及附近水的行为. 据不同范围内得到的SNIFTIRS 谱中水峰的变化提出了三种可能的解释: (A)电极上水的吸附取向的改变; (B)电极附近水分子的长程有序的变化; (C)电极上水的氧化及还原, Pt-O化合物的形成导致薄层中水量的减少。

Abstract: The behaviour of the water on and near the electrode surface in 1.0 mol·dm~(-3) NaF were studied using in-situ FTIR reflection-absorption spectroscopy and cyclic voltammetry. Two mechanisms are proposed to explain the change of water signal in the potential range -0.7 to -0.3 V(vs. SCE)——the change of ordered state of the water molecules near electrode and the formation of adsorbed hydrogen at the cost of the water in the thin layer solution. In the potential range -0.3 to 0.4 V, the orientation of adsorbed OH~- is thought to change from being parallel t perpendicular to the electrode surfacewith in creasing potential. In the range 0.4 to 0.8 V, the slight decrease of water ignal is attributed to thee consum ption of adsorbed OH~- on the formation of Pt-OH on the electrode.