Multi-walled carbon nanotubes (MWCNTs) are one-dimensional nanostructured materials with many interesting properties such as high thermal and electrical conductivities. Wide band gap semiconductor material such as zinc oxide (ZnO) is also of interest. The ZnO-MWCNTs composite is introduced in the field of photocatalysis, sensor and solar cell, mainly focus on the improvement of ZnO properties. Electron transfer of redox species with electrode is the essential prerequisite for the application of ZnO-MWCNTs composite electrode for sensor and solar cell. Here, we investigated the electrochemical properties of ZnO-MWCNTs composite electrode. The techniques utilized for the characterization of the carbon composite semiconductor electrode were cyclic voltammetry and electrochemical impedance spectroscopy. The experiments were carried out in a conventional three-electrode system using home-made ZnO-MWCNTs composite film, platinum rod, and Ag/AgCl as working, auxiliary, and reference electrodes, respectively. The oxidation-reduction behaviors were studied using two different redox couples. The aqueous solution of Fe(CN)₆^3-/Fe(CN)₆^4- has been used as a general model while the acetonitrile solution of I^-/I₃^- has been employed as a representative system for photovoltaic cell. Cyclic voltammogram of  ZnO electrode containing 0.5 wt.% MWCNTs illustrated an increase of anodic peak current and a decrease of anodic peak potential for both Fe(CN)₆^3-/Fe(CN)₆^4- and I^-/I₃^-. The electron transfer resistances at ZnO-MWCNTs electrode for both redox couples were significantly smaller than that of conventional ZnO electrode, indicating its much improved conductivity.

1. PRESENTATION: Electrochemical Analyses of Multi-Walled Carbon Nanotubes Composited Zinc Oxide Electrodes, Microsoft Office Document, 0MB

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