本文介绍了一种测量电极/溶液界面微分电容的新方法,即小幅度正弦波电位法。该方法可用于大部份实际电化学系统的电容测量,且比其他几种常用的测试界面电容的方法,简捷而人为误差较小。但该法不适用于理想不极化电极。 文中还讨论了溶液电阻和电化学反应电阻对该方法适用性的影响。
A new method of measuring electrode/electrolyte interfacial capacitance has been introduced. By making use of the Laplace transformation and convolution theorem, it can be deduced from simple equivalent circuit of electrode/solution interface that there is a linear dependence of the product of peak response current(ira)flowing through the electrode, which is polarized by sine-wave voltage with various angular frequence but the same range,and angular frequence(ω)on the square of angular frequence: im·ω=A·Cd·ω~2+B The interfacial capacitance (Cd)of electrode/solution can be calculated from the derived linear equation. The effects of solution resistance and charge transfer resistance on the suitability of solution resistance and charge transfer resistance on the suitability of the method have also been discussed. The method has proven experimentally superior to those available in textbooks and literatures, and it is shown that the method is applicable to most actual electrochemical systems in spite of its inability for application to ideally nonpolarizable electrode.
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