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Bismuth oxyhalides: synthesis, structure and photoelectrochemical activity

DOI: 10.1039/C6SC00389C DOI Help

Authors: Davinder S. Bhachu (University College London) , Savio J. A. Moniz (University College London) , Sanjayan Sathasivam (University College London) , David O. Scanlon (University College London; Diamond Light Source) , Aron Walsh (University of Bath) , Salem M. Bawaked (King Abdulaziz University) , Mohamed Mokhtar (King Abdulaziz University) , Abdullah Y. Obaid (King Abdulaziz University) , Ivan P. Parkin (University College London) , Junwang Tang (University College London) , Claire J. Carmalt (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Science

State: Published (Approved)
Published: March 2016

Open Access Open Access

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.

Subject Areas: Chemistry


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