高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (3): 453.

• 论文 • 上一篇    下一篇

铜电极阳极溶解过程恒电位电流振荡的动力学模型

雷惊雷, 罗久里   

  1. 四川大学化学系, 成都 610064
  • 收稿日期:1999-01-23 出版日期:2000-03-24 发布日期:2000-03-24
  • 通讯作者: 罗久里(1936年出生),男,博士,教授,博士生导师,主要从事非平衡热力学、非平衡态统计力学研究.
  • 基金资助:

    国家自然科学基金(批准号:29873032)资助

A Dynamic Model of Potentiostatic Current Oscillation of Copper Electrodissolution in Acidic Chloride Solution

LEI Jing-Lei, LUO Jiu-Li    

  1. Department of Chemistry, Sichuan University , Chengdu 610064, China
  • Received:1999-01-23 Online:2000-03-24 Published:2000-03-24

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被引次数

49

摘要： 研究了铜电极在酸性氯化钠溶液中的恒电位电流振荡行为,分析了电极过程中的非线性步骤及电化学耦合因素,提出了一个可能的电极过程动力学模型,并借助线性稳定性分析及分支分析得到了参数坐标空间中的动力学行为区域图.在此基础上,将极化曲线视为稳定非平衡定态区态函(电流)与外控参数(电位)的关系,同时将恒电位电流振荡模拟为稳定极限环振荡,分别计算出了极化曲线与时间-电流振荡曲线,其结果与实验数据相符,表明该类电极过程中的电化学振荡的理论研究可以纳入Hopf分支分析框架之中.

关键词: 铜电极阳极溶解, 电化学振荡, 稳定极限环

Abstract: Amodel of current oscillation of copper potentiostatic electrodissolution in acidic chloride solution is proposed. It involves nonlinear steps dominated by couplings between chemical reactions and current. The linear stability theorem, as well as the bifurcation analysis is applied to discussing regimes of dynamic behavior in the parametric plane. Furthermore, both the polarization curve and the current oscillation curve are calculated respectively modeled as a stable steady state function related to the externally controlled potential and a stable limit cycle on state plane. The theoretical results are in good qualitative agreement with experimental observation reported in literature. It is concluded that the theoretical study of isoamplitude electrochemical oscillation can be achieved in light of Hopf bifurcation analysis.

Key words: Copper electrodissolution, Electrochemical oscillation, Stable limit cycle

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