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Issue 8, 2016
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Bismuth oxyhalides: synthesis, structure and photoelectrochemical activity

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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 red shift with the increasing 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 cm−2 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 shown by X-ray diffraction, leading to internal electric fields that minimize charge carrier recombination.

Graphical abstract: Bismuth oxyhalides: synthesis, structure and photoelectrochemical activity

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The article was received on 26 Jan 2016, accepted on 05 Mar 2016 and first published on 09 Mar 2016


Article type: Edge Article
DOI: 10.1039/C6SC00389C
Citation: Chem. Sci., 2016,7, 4832-4841
  • Open access: Creative Commons BY license
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    Bismuth oxyhalides: synthesis, structure and photoelectrochemical activity

    D. S. Bhachu, S. J. A. Moniz, S. Sathasivam, D. O. Scanlon, A. Walsh, S. M. Bawaked, M. Mokhtar, A. Y. Obaid, I. P. Parkin, J. Tang and C. J. Carmalt, Chem. Sci., 2016, 7, 4832
    DOI: 10.1039/C6SC00389C

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