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Photo-Oxidation of Water Using Nanocrystalline Tungsten Oxide under Visible Light

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Hamilton, JWJ, Byrne, JA, Dunlop, PSM and Brown, NMD (2008) Photo-Oxidation of Water Using Nanocrystalline Tungsten Oxide under Visible Light. International Journal of Photoenergy, 2008 . p. 1. [Journal article]

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URL: http://dx.doi.org/10.1155/2008/185479

DOI: doi: 10.1155/2008/185479

Abstract

The photoelectrolysis of water to yield hydrogen and oxygen using visible light has enormous potential for solar energy harvesting if suitable photoelectrode materials can be developed. Few of the materials with a band gap suitable for visible light activation have the necessary band-edge potentials or photochemical stability to be suitable candidates. Tungsten oxide (Ebg 2.8 eV) is a good candidate with absorption up to λ≈440 nm and known photochemical stability. Thin films of tungsten oxide were prepared using an electrolytic route from peroxo-tungsten precursors. The tungsten oxide thin films were characterised by FESEM, Auger electron spectroscopy, and photoelectrochemical methods. The magnitude of the photocurrent response of the films under solar simulated irradiation showed a dependence on precursor used in the film preparation, with a comparatively lower response for samples containing impurities. The photocurrent response spectrum of the tungsten oxide films was more favourable than that recorded for titanium dioxide (TiO2) thin films. The WO3 photocurrent response was of equivalent magnitude but shifted into the visible region of the spectrum, as compared to that of the TiO2.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:7434
Deposited By:Dr Jeremy Hamilton
Deposited On:18 Jan 2010 15:17
Last Modified:18 Aug 2011 11:15

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