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Photoelectrochemical properties of BiOCl microplatelets

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Original languageEnglish
Pages (from-to)171-177
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume819
Early online date11 Oct 2017
DOIs
DateAccepted/In press - 10 Oct 2017
DateE-pub ahead of print - 11 Oct 2017
DatePublished (current) - 15 Jun 2018

Abstract

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.

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