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Publication - Professor David Fermin

    Photoelectrochemical properties of BiOCl microplatelets


    Stephenson, J, Celorrio, V, Tiwari, D, Hall, SR, Green, DC & Fermín, DJ, 2018, ‘Photoelectrochemical properties of BiOCl microplatelets’. Journal of Electroanalytical Chemistry, vol 819., pp. 171-177


    The photoelectrochemical properties of highly crystalline and phase-pure BiOCl microplatelets synthesised via a room temperature ionic liquid method are reported. X-ray crystallography reveals a tetragonal BiOCl phase, while high resolution electron microscopy shows sheet-like structures with a cross section of approximately 5 μm and thickness in the range of 500 nm. Diffuse reflectance spectroscopy shows a direct bandgap transition at 3.34 eV. Electrochemical measurements of as-prepared BiOCl powders deposited onto fluorine-doped tin oxide electrodes show a sharp cathodic current at − 0.10 V vs RHE at pH 10, which is linked to electron injection into the conduction band edge. Photoelectrochemical measurements in the presence of Na2SO3 as hole-acceptor in solution exhibit a strong potential dependence, switching from cathodic to anodic photocurrents at potentials around 0.70 V vs RHE. The positive photocurrent is associated with SO3 2 − oxidation, while the unexpected negative photocurrents are linked to cathodic material decomposition.

    Full details in the University publications repository