The cyclic voltammetric response of electrochemically heterogeneous surfaces
The cyclic voltammetric response of electrochemically heterogeneous surfaces
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DOI：
10.1016/j.jelechem.2004.07.031
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发表时间：
2004-12-15
影响因子：
4.5
通讯作者：
Compton, RG
中科院分区：
文献类型：
--
作者：
Davies, TJ;Moore, RR;Compton, RG
使用有限差分模拟由两种不同的电极材料组成的电极的循环伏安响应建模。该系统可以被认为是分散在不同电极材料上的一种材料的微电极阵列。首先，详细研究扩散效应时出现的各个微电极之间的距离是不同的，导致一个简单的方法，以获得定性数据的大小不同的电极材料和扩散层厚度。第二，一个更定量的方法来确定的分数覆盖和数量的蒽醌改性的边缘平面热解石墨电极通过比较实验峰到峰的分离与模拟的工作曲线。的结果进行了比较，与相同的电极表面的扫描电子显微镜分析。第三，扩散域方法被应用到基面高度有序热解石墨（HOPG）表面，试图解释基面HOPG伏安图的特征形状。本文提出了一种用宏电极循环伏安法近似测定表面缺陷密度的方法，并在一些不同的氧化还原电对上进行了试验。结果进行了比较与两个以前的扫描隧道显微镜研究基面HOPG。(C)2004 Elsevier B.V.保留所有权利。
The cyclic voltammetric response of an electrode composed of two different electrode materials is modelled using finite difference simulations. The system can be thought of as an array of microelectrodes of one material dispersed over a different electrode material. First, a detailed study into the diffusional effects which arise when the distance between the individual microelectrodes is varied, leads to a simple method with which to obtain qualitative data regarding the size of the different electrode materials and diffusion layer thickness. Second, a more quantitative method is employed to determine the fractional coverage and number of gold particles on an anthraquinone modified edge plane pyrolytic graphite electrode by comparing experimental peak to peak separations with simulated working curves. The results are compared with a scanning electron microscope analysis of the same electrode surface. Third, the diffusion domain approach is applied to the basal plane highly ordered pyrolytic graphite (HOPG) surface in an attempt to explain the characteristic shapes of basal plane HOPG voltammograms. A method is presented for the approximate determination of surface defect density, using macroelectrode cyclic voltammetry, and then trialled on a number of different redox couples. The results are compared with two previous scanning tunnelling microscopy studies of basal plane HOPG. (C) 2004 Elsevier B.V. All rights reserved.