摘要
在一定的条件下 ,将铂电极 BZ化学反应的六变量高维动力学系约化为三变量体系 ,同时对该体系进行了全面的系统动力学分析 .研究结果表明 ,通过改变耦合体系的外控参数条件 ,在将体相保持在均一稳定定态的参数范围内 ,电极反应相可能进入振荡区 ,而呈现出电极反应相与体相的动力学行为不一致性 .进一步计算出体相处于非振荡状态时 ,电极反应相产生电化学振荡的外控参数区域 .
A Pt electrode is usually used as a probe to observe and measure the dynamic behavior of the classical BZ reaction. Due to the coupling of electrode process with pure BZ reaction, a special kind of electrochemical oscillatory system arises. It is no doubt that the quantitative study of the dynamic behavior of electrode BZ reaction system will be helpful to qualify the accuracy and reliability of the detection of pure BZ reaction monitored by an electrode. Therefore, this work will be of great theoretical and practical value. In this article, the systematic-dynamical analysis of a Pt electrode BZ reaction system has been established on the basis of FKN mechanism and Oregonator Model. Under certain conditions, the coupled system of high dimensions involving six variables is reduced to a three-variable dynamical system. Furthermore, by means of linear stability analysis of three-variable system, regimes of dynamic behavior in bulk phase and in electrode reaction phase have been calculated numerically, respectively. Meanwhile, electrochemical oscillations in the electrode reaction phase have been simulated numerically. It is shown that when the bulk phase keeps to be a homogeneous steady state, the electrode reaction phase can enter the oscillatory regime by changing the externally controlled parameters of this coupled system. It turns out that the dynamical behavior of the two subsystems is not always synchronous.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第4期693-696,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 0 0 73 0 2 7
2 0 2 73 0 44 )资助
关键词
铂电极
BZ反应体系
系统动力学
电化学振荡
高维动力学系约化
Pt electrode BZ reaction system
Electrochemical oscillations
Reduction of dynamical systems with high dimensions
Systematic-dynamical analysis