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首页> 外文期刊>Applied Surface Science >Capacitance dispersion in electrochemical impedance spectroscopy measurements of iodide adsorption on Au(111)
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Capacitance dispersion in electrochemical impedance spectroscopy measurements of iodide adsorption on Au(111)

机译：电化学阻抗谱中电容的弥散测量碘在Au（111）上的吸附

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Electrochemical interfaces that display dispersive characteristics do not present the purely capacitive behaviour predicted by the theory of ideally polarised interfaces. For interfaces involving solid electrodes, capacitance dispersion phenomena in the double layer region are usually attributed to the structural characteristics of the electrode surface as well as to the interfacial region. This paper presents a study of the dispersive characteristics, in the double layer potential region, related to the iodide adsorption on an Au(l 1 1) electrode. The study was per-formed by using electrochemical impedance spectroscopy, and the corresponding spectra fitted with an equivalent circuit containing a constant phase element (CPE). The fitting results are compared with capacitance curves obtained by chronocoulometry, in order to analyse the relationship between the CPE and the interfacial capacitance. It was observed the occurrence of dispersive behaviour in the potential regions associated with phase transition processes in the adsorbed layer and to the potential induced reconstruction phenomena. On the other hand, in the potential regions where such phenomena do not occur, the interface presents almost pure capacitive behaviour. These observations provide evidence of the strong contribution of the solution properties to the capacitance dispersion. (c) 2006 Elsevier B.V. All rights reserved.
机译：显示弥散特性的电化学界面不呈现理想极化界面理论所预测的纯电容行为。对于涉及固体电极的界面，双层区域中的电容分散现象通常归因于电极表面的结构特征以及界面区域。本文介绍了在双层电位区域中与碘化物在Au（l 1 1）电极上吸附有关的分散特性的研究。该研究是通过使用电化学阻抗谱进行的，并且相应的谱装有装有恒定相元素（CPE）的等效电路。将拟合结果与通过计时库仑法获得的电容曲线进行比较，以分析CPE和界面电容之间的关系。观察到在与吸附层中的相变过程有关的电位区域中发生了分散行为，并引起了电位引起的重构现象。另一方面，在不发生这种现象的潜在区域中，界面呈现出几乎纯的电容行为。这些观察结果证明了溶液性质对电容色散的强烈贡献。 （c）2006 Elsevier B.V.保留所有权利。

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