摘要
物理系统振荡同步的成功实例已经有很多,但电化学系统振荡同步的实例还不多见。为了将用于物理系统振荡同步的方法应用于电化学系统,探索电化学振荡同步的新方法,以铜阳极在磷酸中的电流振荡为研究对象,以自制的电化学联机装置为工具,以铜阳极的电极电位为控制变量,用比例耦合同步方法研究2个独立电解池中铜阳极电流振荡的同步行为。本文的同步方法将比例调节和耦合方法结合起来,是2个电极电流振荡同步的有效算法。比例耦合同步方法的比例系数K为正值时,产生互同步效果;为负数时,产生反相同步效果。当两电极的振荡波形相同时,互同步的效果好;否则,效果差。在能发生电流振荡的电势范围内,铜在磷酸中阳极溶解的电极电位与电极电流之间成反比关系。根据这个反比关系,定性解释了本文方法实现互同步和反相同步的机理。2个互同步的电极电流之差很接近于零,但因为2个铜阳极的表面粗糙度很难完全相同,导致真实的电化学反应面积也很难完全相同,总有余差存在。根据比例调节的特点,用反证法证明余差的存在是本文的互同步方法能够成功实现的前提条件。最后,本文对互同步算法指出了改进的方向。
Although there were many successful examples of physical systems oscillations＇ synchronization,the samples of electrochemical systems oscillations＇ synchronization were seldom reported.To apply physical systems oscillations＇ synchronization methods to the electrochemical systems and explore the new methods of electrochemistry oscillations＇ synchronization,the current oscillations during the anodic dissolution of copper into phosphoric acid are studied in this paper.The electrochemical apparatus was connected with computer by PCI-1710HG card and the controlling variant was anodes potential.Using the algorithm of proportional coupling synchronization,this paper studies the synchronization of the current oscillations between two independent copper anodes in phosphoric acid.The synchronization algorithm in this paper consisted of proportional controlling method and coupling method,and the algorithm was very effective on the synchronization of two anodes＇ current oscillations.When the proportional coefficient K0,interacting synchronization was realized by the algorithm,and when K0,anti-synchronization was realized.When the two anodes＇ current oscillations waveforms were similar,the effect of interacting synchronization was good,and when the waveforms were different, the effect was bad.Within the potential range in which current oscillations can occur,there was negative correlation between anode potential and current during anodic dissolution of copper into phosphoric acid.According to the negative correlation,the mechanism of synchronization and anti-synchronization in this paper was explained qualitatively.The difference between two synchronized anodes currents was very close to zero.It was impossible that one anodes＇ surface area on which electrochemical reaction occurred was same with another,because one anodes＇ surface roughness could not be just same with another;therefore,the difference could not just be zero,and it was called residual fault.According to the character of proportional controlling,it was proven by apagoge that the existence of residual fault was the precondition of synchronization.Finally,a proposal was proposed to better the synchronization algorithm in this paper.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2011年第4期473-476,共4页
Computers and Applied Chemistry
关键词
铜
阳极
电化学
振荡
同步
copper
anode
electrochemistry
oscillation
synchronization
