Cyclic voltammetry studies of nanoporous semiconductors.: Capacitive and reactive properties of nanocrystalline TiO2 electrodes in aqueous electrolyte
Cyclic voltammetry studies of nanoporous semiconductors.: Capacitive and reactive properties of nanocrystalline TiO2 electrodes in aqueous electrolyte
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DOI：
10.1021/jp0265182
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发表时间：
2003-01-23
影响因子：
3.3
通讯作者：
Bisquert, J
中科院分区：
文献类型：
--
作者：
Fabregat-Santiago, F;Mora-Seró, I;Bisquert, J
扩展网络的纳米级半导体颗粒渗透电解质显示独特的电化学行为。本文报道了利用循环伏安法对纳米多孔电极的电化学性能进行了一般性的研究。已经开发了模型，用于说明这些电极的基本特征：电荷积累，电荷传输和界面电荷转移。这些特征可以转化为简单的电等效，这使我们能够根据伏安扫描期间不同过程的竞争来识别和分类伏安响应的主要特征。描述实验观察结果的一个关键点是本征薄膜电容的电位依赖性。从电子态分布的角度讨论了该电容的物理意义。我们详细描述了数值模拟方法，尽管我们的方法简单，但我们表明这些方法可以定量描述水电解质中纳米多孔TiO2电极的实验数据，包括确定状态密度和绝对能级。
Extended networks of nanosized semiconductor particles permeated with an electrolyte display unique electrochemical behaviors. We report on a general investigation of the electrochemical properties of nanoporous electrodes by means of cyclic voltammetry. Models have been developed accounting for the fundamental characteristics of these electrodes: charge accumulation, charge transport, and interfacial charge transfer. These characteristics can be translated into simple electrical equivalents, which allow us to identify and classify the major features of voltammetry response according to the competition of the different processes during a voltammetric scan. A key point for describing the experimental observations is the potential dependence of the intrinsic film capacitance. The physical meaning of this capacitance is discussed in terms of the distribution of electronic states. We describe in detail the numerical simulation methods, and despite the simplicity of our approach, we show that these methods allow for quantitative description of experimental data of nanoporous TiO2 electrodes in aqueous electrolyte, including the determination of the density of states and the absolute energy levels.