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Atmospheric pressure chemical vapour deposition of boron doped titanium dioxide for photocatalytic water reduction and oxidation

Carmichael, P; Hazafy, D; Bhachu, DS; Mills, A; Darr, JA; Parkin, IP; (2013) Atmospheric pressure chemical vapour deposition of boron doped titanium dioxide for photocatalytic water reduction and oxidation. PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 15 (39) 16788 - 16794. 10.1039/c3cp52665h. Green open access

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Abstract

Boron-doped titanium dioxide (B-TiO2) films were deposited by atmospheric pressure chemical vapour deposition of titanium(IV) chloride, ethyl acetate and tri-isopropyl borate on steel and fluorine-doped-tin oxide substrates at 500, 550 and 600 °C, respectively. The films were characterised using powder X-ray diffraction (PXRD), which showed anatase phase TiO2 at lower deposition temperatures (500 and 550 °C) and rutile at higher deposition temperatures (600 °C). X-ray photoelectron spectroscopy (XPS) showed a dopant level of 0.9 at% B in an O-substitutional position. The ability of the films to reduce water was tested in a sacrificial system using 365 nm UV light with an irradiance of 2 mW cm−2. Hydrogen production rates of B-TiO2 at 24 μL cm−2 h−1 far exceeded undoped TiO2 at 2.6 μL cm−2 h−1. The B-TiO2 samples were also shown to be active for water oxidation in a sacrificial solution. Photocurrent density tests also revealed that B-doped samples performed better, with an earlier onset of photocurrent.

Type: Article
Title: Atmospheric pressure chemical vapour deposition of boron doped titanium dioxide for photocatalytic water reduction and oxidation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c3cp52665h
Publisher version: http://dx.doi.org/10.1039/c3cp52665h
Additional information: © the Owner Societies 2013. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence. PubMed ID: 23999866
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1421195
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