物理化学学报 >> 1991, Vol. 7 >> Issue (02): 178-183.doi: 10.3866/PKU.WHXB19910210

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圆盘微电极的稳态电化学行为

刘小平; 陆君涛; 查全性   

  1. 武汉大学化学系，武汉 430072
  • 收稿日期:1989-12-15 修回日期:1990-10-25 发布日期:1991-04-15
  • 通讯作者: 刘小平

The Steady State Electrochemical Behavior of Microdisk Electrodes

Liu Xiao-Ping; Lu Jun-Tao; Cha Quan-Xing   

  1. Department of Chemistry, Wuhan University, Wuhan 430072
  • Received:1989-12-15 Revised:1990-10-25 Published:1991-04-15
  • Contact: Liu Xiao-Ping

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摘要： 本文利用“均匀表面浓度”处理法研究了微盘电极稳态电化学行为, 给出了溶液中O和R均存在时可逆极化曲线的精确式, 及仅有O存在时不可逆和准可逆极亿曲线的近似式。还讨论了微电极的半径与速率常数K°的测量上限之间的关系。

关键词: 圆盘微电极, “均匀浓度”处理法, 稳态电化学行为

Abstract: In this work, expressions for the steady state voltammetric curve of a microdisk electrode are derived by using "uniform concentration" approach. For reversible electrode reactions, the derived expression is exact, while for irreversible and quasireversible reactions, the expressions are approximate.In the case of irreversible reaction, the maximum relative error of the current calculated from the given expression is about 4%. The approximate expression has the form similar to those for conventional planar electrodes. The relation between the upper limit of measurable rate constant and the radius of microdisk electrode is also discussed.

Key words: Microdisk electrode, "Uniform concentration" approach, Stead State electrochemical behavior