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Electrode kinetics from a single square-wave voltammogram

机译:单方波伏安图的电极动力学

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摘要

A novel methodological approach for processing electrochemical data measured under conditionsudof square-wave voltammetry (SWV) is proposed. The methodology takes advantage of the chronoamperometricudcharacteristics of the electrochemical system observed in the course of the voltammetric experiment,whichudare commonly not considered in conventional SWV.The methodudrequires processing of a single voltammogram only, measured under given set of the potential modulation parameters (i.e. SW frequency and height of the potential pulses). The core idea is to analyze the variation of the current withudtime, considering the last quarter time period of each potential pulse of the potential modulation, insteadudof measuring the single current value from the very end of the pulses. Hence, a single point current measurementudis replaced with a multisampling current procedure, leading to a series of new SW voltammograms measured at differentudtime increments of each potential pulse. The novel methodudis illustrated by the theoretical analysis of a quasireversible electrode reaction of a dissolved and surface confined redox couple, as well as a reversible electrode reaction preceded by a chemical equilibrium reaction (CE mechanism).
机译:提出了一种新的方法学方法来处理在方波伏安法(SWV)条件下测得的电化学数据。该方法利用了伏安法实验过程中观察到的电化学系统的计时安培/ ud特征,这在常规SWV中通常不考虑。该方法 ud仅需要处理单个伏安图,在给定的电位下测量调制参数(即,SW频率和电势脉冲的高度)。核心思想是考虑电势调制的每个电势脉冲的最后四分之一时间周期来分析电流随udtime的变化,而不是从脉冲的最末端开始测量单个电流值。因此,单点电流测量被多次采样电流程序所取代,从而导致在每个电势脉冲的不同 udtime增量下测量一系列新的SW伏安图。通过对溶解和表面受限的氧化还原对的准可逆电极反应以及化学平衡反应之前的可逆电极反应(CE机理)的理论分析说明了该新方法。

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