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Citric acid as an effective anodisationelectrolyte for the fabrication of WO3 photoanodes


Reference:

Zhang, J., Salles, I., Pering, S., Cameron, P., Mattia, D. and Eslava Fernandez, S., 2017. Citric acid as an effective anodisationelectrolyte for the fabrication of WO3 photoanodes. In: Joint Solar Fuels Network and Supersolar Symposium, 2017-04-26 - 2017-04-26, Imperial College London.

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Abstract

Solar water splitting with photoelectrochemical cells is a promising approach to address energy and environmental issues. N-type WO3 has a band gap of 2.7 eV that lies in visible light spectrum. It acts as a photoanode material which can be produced by various methods including anodisation of tungsten metal with fluoride electrolytes. A more sustainable and eco-friendly electrolyte option, citric acid, has proved to produce nanostructured WO3 photoanodes in this work. The readily fabricated WO3 photoanode produces a photocurrent of 0.88 mA at 1.0 V vs. Ag/AgCl in 0.5M aqueous H2SO4 under solar simulation. A comparison of the performance of photoanodes formed by citric acid and by frequently used NH4F electrolyte shows that the use of citric acid results in enhanced photoresponses at low applied potentials (below 0.67 V vs. Ag/AgCl). A combination of characterisation techniques including X-ray diffraction, scanning electron microscopy, linear sweep voltametry, and ultraviolet-visible spectroscopy correlate the photoelectrochemistry with its structural features. The morphology and perfomance of obtained WO3 photoanodes is shown to be dependent on the anodisation duration, current and solvent choice. This work shows the promise of citric acid as an efficient tungsten anodisation electrolyte and opens an avenue to seek more sustainable ways of production of different metal oxides as photoelectrodes via anodisation.

Details

Item Type Conference or Workshop Items (Poster)
CreatorsZhang, J., Salles, I., Pering, S., Cameron, P., Mattia, D. and Eslava Fernandez, S.
DepartmentsFaculty of Engineering & Design > Chemical Engineering
Faculty of Science > Chemistry
Research Centres & Institutes > Reaction and Catalysis Engineering research unit (RaCE)
Research CentresCentre for Sustainable Chemical Technologies
Centre for Advanced Separations Engineering (CASE)
?? WIRC ??
Centre for Nanoscience and Nanotechnology
RefereedNo
StatusPublished
ID Code55447

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