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Photoelectrochemical oxidation behavior of organic substances on TiO2 thin-film electrodes

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Abstract

The photoelectrocatalytic oxidation characteristics of salicylic acid, formic acid and methanol on anodized nanoporous titanium dioxide (TiO2) thin-films were investigated by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. From dark to ultraviolet illumination, the open circuit potential (OCP) and film resistance of TiO2 films decreased markedly. A general equivalent circuit model was proposed for the photoelectrochemical system anodic TiO2 thin-film electrode/test solution. The photoelectrochemical oxidation process of the organic compounds showed similar impedance features at OCP and was controlled by the charge transfer step. According to the polarization curves of the base solution and organic solutions, the kinetic rate curves for the photoelectrocatalytic oxidation of pure organic species were obtained as a function of the potential bias. One photooxidation peak was first observed at a bias potential of ca. 0.26 V for these species with low concentrations.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (NSFC) and Shanghai BaoSteel Company (Grant No. 50471105), Shanghai Science & Technology Council (0352nm074), and Shanghai Municipal Education Commission (04AE96).

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Authors and Affiliations

  1. Institute of Materials, Shanghai University, P.O. Box 269, 149 Yanchang Road, Shanghai, 200072, People Republic of China

    Mou Cheng Li & Jia Nian Shen

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  1. Mou Cheng Li
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  2. Jia Nian Shen
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Correspondence to Mou Cheng Li.

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Li, M.C., Shen, J.N. Photoelectrochemical oxidation behavior of organic substances on TiO2 thin-film electrodes. J Solid State Electrochem 10, 980–986 (2006). https://doi.org/10.1007/s10008-005-0043-5

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  • DOI: https://doi.org/10.1007/s10008-005-0043-5

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