Photoelectrochemical characterisation of TiO 2 thin films derived from microwave hydrothermally processed nanocrystalline colloids

Shanqing Zhang; William Wen; Dianlu Jiang; Huijun Zhao; Richard John; Gregory J. Wilson; Geoffrey D. Will

doi:10.1016/j.jphotochem.2005.08.034

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Photoelectrochemical characterisation of TiO 2 thin films derived from microwave hydrothermally processed nanocrystalline colloids

Journal article

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Photoelectrochemical characterisation of TiO 2 thin films derived from microwave hydrothermally processed nanocrystalline colloids

Shanqing Zhang, William Wen, Dianlu Jiang, Huijun Zhao, Richard John, Gregory J. Wilson and Geoffrey D. Will

Journal of Photochemistry and Photobiology, A: Chemistry, Vol.179(3), pp.305-313

2006

DOI: https://doi.org/10.1016/j.jphotochem.2005.08.034

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Abstract

Hydrothermal treatment

Microwave

Photoelectrochemical oxidation

TiO 2 electrode

Titanium dioxide (TiO2) thin films fabricated with different TiO2 colloids were characterised using photoelectrochemical techniques. TiO2 colloids were firstly prepared via hydrolysis of titanium butoxide and peptisation process with no hydrothermal process (labelled as NP). The resulting colloids were then subjected to different hydrothermal processes, i.e., 15-h convection hydrothermal (labelled as CH) treatment; 5-, 10- and 15-min microwave hydrothermal treatment (labelled as M5, M10 and M15, respectively). The colloids were used to prepare TiO2 thin films on conducting indium-doped tin oxide (ITO) substrates (i.e., CH, M15, M10, M5 and NP electrodes, respectively) using a controlled dip-coating technique. The experimental results demonstrate that the oxidation capacities of the electrodes for water and glucose are in the order of CH > M15 > M10 > M5 > NP. In contrast, the oxidation capacities of the electrodes for potassium hydrogen phthalate (KHP) are in the order of M15 > M10 > CH. It was also found that the CH electrode could be easily poisoned by high concentration of KHP, while microwave-processed electrodes (M15, M10 and M5) are immune from the KHP poisoning. The results presented demonstrate that microwave hydrothermal processing is a promising alternative method to the traditional convection hydrothermal treatment of colloids that provides electrodes with increased photocatalytic properties for the oxidation processes of adsorption-based organic compounds, such as KHP.

Details

Title: Photoelectrochemical characterisation of TiO 2 thin films derived from microwave hydrothermally processed nanocrystalline colloids
Authors: Shanqing Zhang (Corresponding Author) - Griffith University
William Wen (Author) - Griffith University
Dianlu Jiang (Author) - Griffith University
Huijun Zhao (Author) - Griffith University
Richard John (Author) - Griffith University
Gregory J. Wilson (Author) - Queensland University of Technology
Geoffrey D. Will (Author) - Queensland University of Technology
Publication details: Journal of Photochemistry and Photobiology, A: Chemistry, Vol.179(3), pp.305-313
Publisher: Elsevier BV
DOI: 10.1016/j.jphotochem.2005.08.034
ISSN: 1873-2666
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737992702621
Output Type: Journal article

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