【作者】 束志恒；

【导师】 李学良；

【作者基本信息】 合肥工业大学 ， 应用化学， 2001， 硕士

【摘要】 电化学体系中存在着丰富的振荡行为，在许多体系中都发现了确定性的混沌运动。电化学复杂振荡的研究，对电极反应过程的机理和对生物行为的研究具有重要的意义。对电化学复杂振荡的耦合及同步的研究，说明了两个体系互相作用而形成不同行为的机制。对电化学复杂振荡的混沌控制研究，则为我们提供了对复杂振荡体系中包含的丰富信息开发利用的方法。本篇论文中，以恒电势下铜阳极在磷酸体系中的电流振荡行为作为研究对象。 我们采用高速数据采集卡完成电化学联机装置，此装置能在Windows下完成高达10KHz的采样速度；完成对非线性数据处理程序算法的编写，采用数字滤波方法排除噪音对数据的干扰；并能完成对电化学体系的实时测量和控制；同时能适应一般电化学测试的不同要求。 在电化学振荡的影响因素的研究中，采用线性电位扫描法，通过改变转速、温度和浓度研究了对振荡行为的影响。发现振荡的产生是电极表面膜的生成、溶解与一定液相传质作用耦合的结果。 通过温度对振荡电势范围的影响，得出温度对电势的参数范围，通过改变温度和电势，观察到小幅振荡、周期振荡、混合振荡、准周期振荡、混沌振荡等行为。采用非线性分析方法，确定铜在磷酸体系中的阳极溶解过程中存在确定性的混沌运动，并计算出其李普雅诺夫指数为0.52。 通过改变两线电极间的距离、参比电极的位置以及在两电极之间隔以铂片和聚丙烯片，研究了电场和物质转移对耦合作用的影响。结果表明两电极的振荡互相影响，可以形成异相、锁相、同相等同步行为；物质转移作用对同相同步的形成起着决定性的作用；电化学复杂振荡行为是电极表面各部分通过耦合作用机制而相互影响的结果；对铜阳极的振荡行为的耦合作用及同步现象未见文献报道。 采用延迟反馈控制法对电化学复杂振荡中的混沌行为进行的控制研究表明，延迟反馈控制法对铜在磷酸中的混沌行为的控制是有效的。我们达到了对周期-1、周期-2、周期-3的稳定控制，并将延滞时间和控制因子对控制效果的影响进行了研究，找到了控制因子的参数范围。在实验中对实现对周期-3的控制未见文献报道。更多还原

【Abstract】 There are abundant oscillations in electrochemical system, many determined chaos had been found .The study of electrochemical complex oscillations is important to the study of the mechanism of electrochemical reactions and the action of organism. It抯 shown that coupling and synchronization of electrochemical oscillations proved that two systems came into different way by acting each other. The study of chaos control in electrochemical complex oscillation gives we a way to utilize the information contained in the electrochemical system. In this paper, the anodic dissolution of copper into phosphoric acid was studied. We connect the electrochemical apparatus with computer by PCI-I71OHG card; the data acquisition can reach 10KW, and complete the program of disposal non-liner data. By numeral filtering, we get rid of noise in data. It can measure and control in real time and fit the common electrochemical measurement. By sweep voltammograms, we study the influence on the electrochemical oscillation through varying the concentration, temperature and rotating speed to find that the oscillation is the result of the breaking and forming of film coupling with the mass transport. When we varied the potential or temperature, find many type of oscillation, and determined there exist chaos oscillation by non-liner analysis. Varying the distance, the location of reference electrode and blocking by setting platinum sheet and polypropylene sheet studied the coupling influence of electric field and mass transport. The results proved that the synchronization was determined by mass transport, from the result of experience, we can conclude that the electrode surface can be considered as consisting of a large number of identical elementary. We used means of the delay feedback to control the chaos in the electrochemical complex oscillations; the result proved that the method is in effect. By this means, we stabilized the period one, period two and period three, and found the range of control-factor.更多还原