Cyclic Voltammetric and Ac Impedance Behavior of TiO 2  Electrodes under UV Illumination | Zendy

Cui Xiaoli | Zendy; Jiang Zhiyu | Zendy

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Cyclic Voltammetric and Ac Impedance Behavior of TiO 2 Electrodes under UV Illumination

Author(s) -

Cui Xiaoli,

Jiang Zhiyu

Publication year - 2003

Publication title -

journal of the chinese chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.329

H-Index - 45

eISSN - 2192-6549

pISSN - 0009-4536

DOI - 10.1002/jccs.200300141

Subject(s) - electrode , chemistry , dielectric spectroscopy , ultraviolet , photocurrent , cyclic voltammetry , electrical impedance , analytical chemistry (journal) , capacitance , anode , irradiation , light intensity , electrochemistry , optoelectronics , materials science , optics , chromatography , physics , nuclear physics , electrical engineering , engineering

Electrochemical behavior of an ITO/TiO 2 electrode both under ultraviolet (UV) illumination and in the dark was investigated using the methods of cyclic voltammetry and ac impedance spectroscopy. A new oxidative peak is observed at 0.15 V when the TiO 2 electrode was illuminated by UV light for a certain time. The peak current and the anodic photocurrent increased with the increase of UV light intensity. It is assumed that the new peak belonging to the oxidation of Ti 3+ , which was formed on the electrode surface during the UV illumination. It is also found that the apparent resistance was decreased but the capacitance was increased when the TiO 2 electrode was illuminated by UV light according to the measurement results of ac impedance. Based on the results in this paper, it was directly proved that Ti 3+ was actually formed when the electrode was irradiated by UV light.

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