Abstract: 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.

Key words: Pt electrode BZ reaction system, Electrochemical oscillations, Reduction of dynamical systems with high dimensions, Systematic-dynamical analysis