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Issue 1, 2017
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Mesoporous thin film WO3 photoanode for photoelectrochemical water splitting: a sol–gel dip coating approach

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Abstract

A facile and cost-efficient method to fabricate a mesoporous structured WO3 photoanode was implemented for use in a tandem dual photosystem water splitting photoelectrochemical cell. Semi-transparent thin films of tungsten trioxide were fabricated by sol–gel process, incorporating a block co-polymer to induce a template-directed mesoporous structure. These thin films are deposited by dip coating onto transparent conducting oxide substrates and crystallized at a low temperature of 400 °C in air. These WO3 photoanodes exhibit a photocurrent of up to 0.6 mA cm−2 in potassium phosphate buffers of pH 2, 4, and 6 at 1.23 V vs. RHE under 300 mW cm−2 visible (400–900 nm) light irradiation with a faradaic efficiency of up to 75%. Furthermore, we have demonstrated that corrosion occurs in electrolytes of pH > 4. The faradaic efficiencies in varying pH solutions suggest that parasitic redox reactions occurs in acidic conditions, limiting the O2 production and demonstrating the need for stable surface co-catalysts to increase faradaic efficiencies. In neutral conditions, protective layers and/or co-catalysts are needed for increasing WO3 photoanode stability.

Graphical abstract: Mesoporous thin film WO3 photoanode for photoelectrochemical water splitting: a sol–gel dip coating approach

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Submitted
11 Oct 2016
Accepted
20 Dec 2016
First published
09 Jan 2017

Sustainable Energy Fuels, 2017,1, 145-153
Article type
Paper

Mesoporous thin film WO3 photoanode for photoelectrochemical water splitting: a sol–gel dip coating approach

S. Hilliard, G. Baldinozzi, D. Friedrich, S. Kressman, H. Strub, V. Artero and C. Laberty-Robert, Sustainable Energy Fuels, 2017, 1, 145
DOI: 10.1039/C6SE00001K

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