法拉第电流
法拉第效率
电化学
电极
电容
循环伏安法
分析化学(期刊)
材料科学
电化学窗口
伏安法
电容感应
化学
工作电极
电气工程
电解质
色谱法
物理化学
工程类
离子电导率
作者
Madeleine Dupont,Scott W. Donne
摘要
Development of an electrochemical method for separating the contributions made by faradaic and non-faradaic processes to the total specific capacitance of an electrochemical capacitor electrode is reported. The method is based on step potential electrochemical spectroscopy (SPECS), and its application is demonstrated on activated carbon electrodes in aqueous media. The method involves applying a sequence of small potential steps (±25 mV) across the electrochemical window of the electrode material, with sufficient rest time between steps to allow for current equilibration. Modelling of the resultant i-t data using combined resistive, capacitive, diffusional and residual current terms allows for separation of the faradaic and non-faradaic terms. The behavior of these contributions across the electrode potential window is reported and discussed in comparison with conventional methods of electrochemical analysis, such as cyclic voltammetry.
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