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

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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.

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