首页> 外文期刊>International Journal of Electrochemical Science >Electron-Transfer Kinetics of V(IV)/V(V) and V(II)/V(?) Couples for Different State of Charge
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Electron-Transfer Kinetics of V(IV)/V(V) and V(II)/V(?) Couples for Different State of Charge

机译:不同荷电状态下V(IV)/ V(V)和V(II)/ V(?)夫妇的电子转移动力学

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The electrochemical behavior of the V(/V( and V(/V() redox couples has been studied at agraphite electrode by cyclic voltammetry in sulfuric acid solutions. The diffusion coefficient (D) andthe rate constant (k) of V(/V( and V(/V() redox couples for varying state of charge (SOC)can be calculated by cyclic voltammetry. The values of Da(diffusion coefficient of anode) and ka(therate constant of anode) are increased for V(/V( couple while decreased for V(/V() couplewith increasing of SOC. Electrochemical impedance spectroscopy (EIS) is employed to studymechanism of the two couples in sulfuric acid medium. Characteristic EIS plots with the capacitivesemicircle in high frequency and the Warburg tail in low frequency are observed for the two couples,implying that both the electrochemical and diffusion process play important roles in V(/V( andV(/V() couples, the two electrode processes are controlled by both electron-transfer and mass- transfer.
机译:在硫酸溶液中,通过循环伏安法研究了石墨电极上V(/ V(和V(/ V())氧化还原对的电化学行为,V(/ V)的扩散系数(D)和速率常数(k)。 (和V(/ V()可以通过循环伏安法计算出不同电荷状态(SOC)的氧化还原对。Da(阳极的扩散系数)和ka(阳极的速率常数)的值随V(/ V (偶数随着V(/ V()偶数的减小而降低,并随着SOC的增加而变化。电化学阻抗谱(EIS)用于研究硫酸介质中两对偶极的机理。特征EIS曲线具有高频的电容性半圆和低频的Warburg尾部观察到两对电极的频率,这表明电化学和扩散过程在V(/ V(和V(/ V())对中都起着重要作用,这两个电极过程都受电子转移和质量转移的控制。

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