A novel method for the synthesis of titania nanotubes using sonoelectrochemical method and its application for photoelectrochemical splitting of water

This new method describes the application of sonoelectrochemistry to quickly synthesize well-ordered and robust titanium dioxide (TiO 2) nanotubular arrays. Self-ordered arrays of TiO 2 nanotubes of 30–100 m in diameter and 300–1000 nm in length can be rapidly synthesized under an applied potential...

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Bibliographic Details
Published in:Journal of catalysis 2007-03, Vol.246 (2), p.362-369
Main Authors: Mohapatra, S.K., Misra, M., Mahajan, V.K., Raja, K.S.
Format: Article
Language:English
Subjects:
Catalysis
Chemical synthesis
Chemistry
Electricity
Exact sciences and technology
General and physical chemistry
Nanotubes
Photoelectrocatalysis
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Research methodology
Sonoelectrochemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO 2 nanotubes
Ultrasonic chemistry
Ultrasonic technology
Water splitting
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Summary:This new method describes the application of sonoelectrochemistry to quickly synthesize well-ordered and robust titanium dioxide (TiO 2) nanotubular arrays. Self-ordered arrays of TiO 2 nanotubes of 30–100 m in diameter and 300–1000 nm in length can be rapidly synthesized under an applied potential of 5–20 V. The rate of formation of the TiO 2 nanotubes by the sonoelectrochemical method is found to be almost twice as fast as the magnetic stirring method. It also demonstrates that high-quality nanotubes can be prepared using high viscous solvents like ethylene glycol under ultrasonic treatment. The TiO 2 nanotubes prepared in the organic electrolytes (ethylene glycol) are then annealed under H 2 atmosphere to give TiO 2− x C x types material having a band gap of around 2.0 eV. This process is found to be highly efficient for incorporating carbon into TiO 2 nanotubes. Various characterization techniques (viz., FESEM, GXRD, XPS, and DRUV–vis) are used to study the morphology, phase, band gap, and doping of the nanotubes. The photoelectrocatalytic activity of these materials to generate H 2 by water splitting is found to be promising at 0.2 V vs Ag/AgCl.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2006.12.020