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Bismuth Oxyhalides: Synthesis, Structure and Photoelectrochemical Activity

Bhachu, DS; Moniz, S; Sathasivam, S; Scanlon, DO; Walsh, A; Bawaked, S; Mostafa, MM; ... Carmalt, CJ; + view all (2016) Bismuth Oxyhalides: Synthesis, Structure and Photoelectrochemical Activity. Chemical Science , 7 (8) pp. 4832-4841. 10.1039/C6SC00389C. Green open access

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Abstract

We report the synthesis and photoelectrochemical assessment of phase pure tetragonal matlockite structured BiOX (where X = Cl, Br, I) films. The materials were deposited using aerosol-assisted chemical vapour deposition. The measured optical bandgaps of the oxyhalides, supported by density functional theory calculations, showed a redshift with the size of halide following the binding energy of the anion p-orbitals that form the valence band. . Stability and photoelectrochemical studies carried out without a sacrificial electron donor showed the n-type BiOBr film to have the highest photocurrent reported for BiOBr in the literature to date (0.3 mA/cm2 at 1.23 V vs RHE), indicating it is an excellent candidate for solar fuel production with a very low onset potential of 0.2 V vs RHE. The high performance was attributed to the preferred growth of the film in the [011] direction, as show by X-ray diffraction, leading to internal electric fields that minimize charge carrier recombination.

Type: Article
Title: Bismuth Oxyhalides: Synthesis, Structure and Photoelectrochemical Activity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/C6SC00389C
Publisher version: http://doi.org/10.1039/C6SC00389C
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
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/1476781
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