Current-Potential-Time Response of the Second-Order Co-Reactant Mechanism: An Analytical Theoretical Approach

IF 3.5 4区 化学 Q2 ELECTROCHEMISTRY ChemElectroChem Pub Date : 2025-02-05 DOI:10.1002/celc.202400633
Eduardo Laborda, Javier López-Asanza, Judit Moreno-Molina, Joaquín Gonzalez, Angela Molina
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Abstract

An analytical approach is presented for the voltammetric and chronoamperometric study of a second-order cyclic-type mechanism where two species are ‘activated’ electrochemically and subsequently react in solution, as observed in co-reactant electrochemiluminescence mechanisms. Closed-form expressions are derived for the current-potential-time response and for the surface species concentrations as a function of the chemical rate constant, the concentration ratio of the initial species, and their formal potentials. Their effects on the voltammetric signal are analyzed, pointing out a wave-splitting behaviour for fast kinetics, which is tied to the rates of formation and consumption of the ‘activated’ co-reactant.

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二阶共反应物机理的电流-电位-时间响应:一种分析理论方法
本文提出了一种分析方法,用于研究二阶循环型机制的伏安法和时变法,在这种机制中,两个物种被电化学 "激活",随后在溶液中发生反应,正如在共反应物电化学发光机制中观察到的那样。得出了电流-电位-时间响应和表面物种浓度的闭式表达式,它们是化学速率常数、初始物种浓度比和它们的形式电位的函数。分析了它们对伏安信号的影响,指出快速动力学的分波行为与 "活化 "共反应物的形成和消耗速率有关。
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来源期刊
ChemElectroChem
ChemElectroChem ELECTROCHEMISTRY-
CiteScore
7.90
自引率
2.50%
发文量
515
审稿时长
1.2 months
期刊介绍: ChemElectroChem is aimed to become a top-ranking electrochemistry journal for primary research papers and critical secondary information from authors across the world. The journal covers the entire scope of pure and applied electrochemistry, the latter encompassing (among others) energy applications, electrochemistry at interfaces (including surfaces), photoelectrochemistry and bioelectrochemistry.
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