恒电位下铜电极电流振荡的延时控制  

The Time Delay Control of Current Oscillation of Potentiostatic Anodic Dissolution of Copper

作　　者：李学良[1] 鲁道荣[1] 何建波[1] 王华林[1] 

机构地区：[1]合肥工业大学化工学院应用化学系,合肥230009

出　　处：《物理化学学报》2002年第3期218-222,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(29976009);教育部高等学校骨干教师资助计划;安徽省自然科学基金(01044302)资助项目~~

摘　　要：采用铜电极的阳极溶解作为研究对象,开展电流振荡的延迟控制方法的研究.调节控制信号中延迟时间及控制系数的大小,延迟时间对电流影响作用明显,观察到周期变长和变短的结果,小延时下振荡周期变大,大延时下周期变小.延时控制也使振荡的波形产生明显的变化,并使原有的周期振荡呈现出混沌振荡.控制系数对振荡产生不同的影响,呈现出波形分裂、混合振荡等现象.控制系数加大时,这种峰的分裂变得更加强烈,阳极溶解电流产生了混沌振荡.控制后的振荡频率与原有频率有简单的比例关系.文中对延迟控制产生特定波形的机制进行了分析和讨论.The difference between the delayed out put signal and the output signal itself is used as a control signal, time-delayed control is applied to the course of copper anodic dissolution in phosphoric acid solution. The time of delay and the weight of the feedback are adjusted in the experiment; the influence of time delay and control strength on potentiostatic current oscillation of anodic dissolution of copper is studied. The periods and amplitudes of current oscillation are strongly dependent on the delay time and control weight. Time delay has an distinct effect on the frequency of current oscillation. This feedback performs the self-control and self-adjust. Oscillation period is large at small time delay, but is small at large time delay. Time delay has a profound effect on waveform of cur-rent oscillations, and the increase of the control strength results in a bifurcation of current oscillations. Low control strength will tend to stabilize periodic orbits. With the increase of the control strength, the newly created periodic oscillation states increase, and mixed-mode oscillations and these orbits can be stabilized. Under appropriate control conditions, period-3 oscillations are found and can be stabilized. At higher feedback strengths, chaotic states appear. Simple integer proportions are exhibited and oscillations are controlled by the periods of inherent oscillation and the periods of delay time the control mechanism and emergence of special oscillation are analyzed and discussed.

关 键 词：阳极溶解 电流振荡 化学混沌 延迟控制 恒电位 铜电极 电化学振荡体系 

分 类 号：O646.54[理学—物理化学]