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Thin layer cyclic voltammetry measurements liquid / liquid interfacial electron transfer rate theory

Author: YaoDongNa
Tutor: LuXiaoQuan；KangJingWan
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Thin layer cyclic voltammetry Liquid / liquid interface Electron transfer rate Theory
CLC: O647.1
Type: Master's thesis
Year: 2010
Downloads: 122
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Abstract

As the liquid / liquid interface can be seen as an analog or synthetic film membrane simple model of electron transfer processes on the understanding of the complex physiological changes in the organism has an important significance. Thin layer cyclic voltammetry is equal to 1998 Anson proposed by a research liquid / liquid interface charge transfer process the new method. This method because of its simple and easy to operate and so become a research liquid / liquid interfacial electron transfer process a powerful tool, so use this method for liquid / liquid interfacial electron transfer rate of research is particularly important. This paper is divided into four parts, including the following elements: 1. Briefly review the cyclic voltammetry measurements thin liquid / liquid interfacial electron transfer of the development process, a detailed overview of recent thin-layer cyclic voltammetry liquid / liquid interfacial electron transfer rate in the theoretical and experimental research progress, and its possible influencing factors were summarized and analyzed. This chapter includes: (1) the development of thin-layer cyclic voltammetry background; (2) thin-layer cyclic voltammetry experiments principle; (3) thin-layer cyclic voltammetry measurements liquid / liquid interfacial electron transfer rate factors ; (4) thin-layer cyclic voltammetry at the liquid / liquid interface Electrochemistry. 2. Anson and put forward cyclic voltammetry measurement of thin liquid / liquid interfacial electron transfer rate theory, but this theory due to lack of boundary conditions without causing researchers. This chapter presents a new theoretical guidance, improve the Anson proposed theory is insufficient. New theoretical guidance is not only the concentration of the organic phase reactant selection criteria, but also to select the appropriate concentration of the aqueous phase reactants prerequisite. We proved by experiments that the validity of the theory. In addition, we also in-depth analysis of the thin-layer thickness on the liquid / liquid interfacial electron transfer rate effects, the results showed that by increasing the layer thickness can be measured by a faster reaction rate system, thus overcoming the aqueous phase by increasing the means to measure the concentrations of the reactants Rapid reaction system in difficulties. 3 This chapter describes a simple measurement of the liquid / liquid interface, multi-step electron transfer rate method. Based on the proposed theory, multi-step process of electron transfer rate constant by thin-layer cyclic voltammetry be conveniently measured. By this method we determined in the aqueous phase containing the K ₄ Fe (CN) ₆ and nitrobenzene ZnTPP thin layer of electron transfer between the two-step process of a its rate constant k ₁ = 0.12 cm s ^{-1 M ^{-1 , k ₂ = 0.15 cm s ^{-1 M ^{-1 . In addition, according to this theory, we use numerical simulations to further investigate the interfacial electron transfer reactions in multi-step some of the relevant factors, and be verified by experiment. The results not only give a two-phase reactant concentration ratio and the layer thickness on the impact of multi-step electron transfer and consistent theory and experiment also proved the validity of the theory. 4 thin-layer cyclic voltammetry determination as the most simple liquid / liquid interface electron transfer rate on a new approach, with its unique advantages become probe interfacial electron transfer rate of the favorable means. In this paper, numerical simulation of the interface thin layer cyclic voltammetry multistep electron transfer and single-step electron transfer rate measurement were compared. Discussed separately analyzed two-phase reactant concentration ratio, layer thickness and the diffusion coefficient of the interfacial electron transfer rate multi-step and single-step electron transfer rate. The results shows that for a multi-step electron transfer reaction of the first step of electron transfer results obtained with the single-step electron transfer process is almost the same, which implies that the electron transfer to the multi-step The first step can be approximated by a single electron transfer step electron transfer process to deal with. Furthermore, the results also show that the electron transfer to the multi-step step variation of electron transfer reactions with the electron transfer step is not the same or opposite. This suggests that for multi-step electron transfer in the second step after the electron transfer process is more complex, more numerous factors, variation and more varied.}}}}

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