双盘工作电极参比电位采样快扫伏安方法

Twin Disk Working Electrode:Potential Sampling Method for Cyclic Voltammetric Measurements

报道一种双铂盘工作电极、相应的毛细管参比电极和竖直式电化学池设计并用于快速循环伏安测量.双工作电极包括一个常规工作电极,一个辅助工作电极.后者在使用中接地,仅提供参比电位来控制工作电极的电位.参比毛细管尖端安设在接近辅助工作电极的位置上;用0.3mm直径Pt盘工作电极,在电位扫描速度高达10kV/s都可以得到类似于100%iR补偿的伏安曲线,而不必使用iR补偿电路.本文围绕高扫速伏安法中工作电极电位的准确控制问题做了一些初步的探讨.

A Pt-disk twin working electrode and related reference capillary electrode and vertical cell were designed and used for fast cyclic voltammetric(CV) measurements. The twin electrode involves a working electrode and an auxiliary working electrode. The later is grounded, only providing reference potentials for the potential control of the working electrode . The capillary tip of the reference electrode can be set on a close position to the surface of the auxiliary working electrode; nearly 100% iR compensations were obtained at working electrode with 0.3 mm diameter at scan rate as high as 10 kV/s without using iR compensation circuit. Discussion was made on the precise potential control of working electrode at high scan rate CV experiments.