Visible light-induced charge storage, on-demand release and self-photorechargeability of WO3 film

Charlene Ng; Yun Hau Ng; Akihide Iwase; Rose Amal

doi:10.1039/C1CP20412B

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Visible light-induced charge storage, on-demand release and self-photorechargeability of WO₃ film†‡

Charlene Ng,^a Yun Hau Ng,^a Akihide Iwase^a and Rose Amal*^a

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* Corresponding authors

^a ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Engineering, The University of New South Wales, Sydney New South Wales 2052, Australia
E-mail: r.amal@unsw.edu.au
Fax: +61 2 9385 5966
Tel: +61 2 9385 4361

Abstract

Tungsten oxide (WO₃) electrodes subjected to a positive bias are self-photorecharged with alkali cations in the electrolyte during visible light illumination. Upon photoexcitation, part of the photogenerated charges generated by WO₃ is stabilized by the cations and stored in situ within the WO₃ framework. This light-induced storage of charges is subsequently utilized in dark conditions in an on-demand manner and is able to be recharged in the successive illumination cycles. The amount of charges stored is shown to be dependent on the cation ionic radii and the presence of these intercalated cations is verified by X-ray diffraction (XRD) and inductively coupled plasma mass spectroscopy (ICP-MS). This self-photorecharge and on-demand charge-release phenomena demonstrate the ability of WO₃ to supply photoexcited charges under dark condition in a photoelectrochemical reaction with greater flexibility.

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Article information

DOI: https://doi.org/10.1039/C1CP20412B
Article type: Paper
Submitted: 16 Feb 2011
Accepted: 03 Jun 2011
First published: 24 Jun 2011

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Phys. Chem. Chem. Phys., 2011,13, 13421-13426

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Visible light-induced charge storage, on-demand release and self-photorechargeability of WO₃ film

C. Ng, Y. H. Ng, A. Iwase and R. Amal, Phys. Chem. Chem. Phys., 2011, 13, 13421 DOI: 10.1039/C1CP20412B

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