Electrochemistry in tetrahydrofuran and at low temperature: protocol, procedures and methods

Electrochemistry in tetrahydrofuran and at low temperature: protocol, procedures and methods
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四氢呋喃和低温下的电化学:方案、程序和方法

DOI:
10.1002/poc.1574
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发表时间:
2009
影响因子:
1.8
通讯作者:
Baron R
Baron R
中科院分区:
化学4区
文献类型:
--
作者:
Baron R

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本综述描述了我们实验室在过去 5 年中开发的 THF 和低温电化学研究的方案、程序和方法。 THF 中的电化学研究受益于较大的可接近电位窗口。然而,实际上,有必要避免电化学电池中存在湿气。必须为这些测量设计特定的参比电极。微电极的伏安响应受介质电阻率的影响可以忽略不计,因此优于大电极。此外,还开发了一种对微电极获得的伏安曲线和计时电流曲线进行定量分析的方法。使用 Shoup 和 Szabo 表达式拟合计时电流测量结果使我们能够估计底物的扩散系数。在大范围扫描速率下测量的循环伏安图的建模可以确认基材DA的扩散系数,确定电生成分子DB的扩散系数,形式电势E,转移系数α和电子转移的标准异质速率常数k0。通常,系统在从室温到 192 K 的温度范围内进行研究。在不同温度下获得的参数用于通过阿累尼乌斯图提取扩散系数 EA(D) 和电子转移反应 EA(k0) 的活化能。版权所有 © 2009 约翰·威利父子有限公司
This review describes the protocol, procedures and methods for electrochemical studies in THF and at low temperature that have been developed in the course of the last 5 years in our laboratory. Electrochemical studies in THF benefit from a large accessible potential window. In practice, it is however necessary to avoid the presence of humidity in the electrochemical cell. A specific reference electrode had to be designed for those measurements. Microelectrodes, the voltammetric response of which is negligibly affected by the resistivity of the medium, were preferred to macroelectrodes. Moreover, a methodology has been developed for the quantitative analysis of both voltammetric and chronoamperometric curves obtained for the microelectrodes. The fitting of chronoamperometric measurements using the Shoup and Szabo's expression allows us to estimate the diffusion coefficient of the substrate. The modelling of the cyclic voltammograms measured over a large range of scan rates allows the confirmation of the diffusion coefficient of the substrateDA, the determination of the diffusion coefficient of the electrogenerated moleculeDB, of the formal potentialE, of the transfer coefficientαand of the standard heterogeneous rate constant for the electron transferk0. Typically, systems are investigated at temperatures ranging from room temperature to 192 K. Parameters obtained at various temperatures are used to extract, through Arrhenius plots, the activation energies both for the diffusion coefficientEA(D) and for the electron transfer reactionEA(k0). Copyright © 2009 John Wiley & Sons, Ltd.
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