Photoelectrochemical properties of BiOCl microplatelets

Julie Stephenson; Veronica Celorrio; Devendra Tiwari; Simon R. Hall; David C. Green; David J. Fermin

doi:10.1016/j.jelechem.2017.10.024

Photoelectrochemical properties of BiOCl microplatelets

Julie Stephenson, Veronica Celorrio, Devendra Tiwari, Simon R. Hall, David C. Green, David J. Fermin

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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 SO32 − oxidation, while the unexpected negative photocurrents are linked to cathodic material decomposition.

Original language	English
Pages (from-to)	171-177
Number of pages	7
Journal	Journal of Electroanalytical Chemistry
Volume	819
Early online date	24 May 2018
DOIs	https://doi.org/10.1016/j.jelechem.2017.10.024
Publication status	Published - 15 Jun 2018
Externally published	Yes

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10.1016/j.jelechem.2017.10.024Licence: CC BY

1-s2.0-S1572665717307269-mainFinal published version, 1.08 MBLicence: CC BY

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title = "Photoelectrochemical properties of BiOCl microplatelets",

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 SO32 − oxidation, while the unexpected negative photocurrents are linked to cathodic material decomposition.",

author = "Julie Stephenson and Veronica Celorrio and Devendra Tiwari and Hall, \{Simon R.\} and Green, \{David C.\} and Fermin, \{David J.\}",

note = "Funding information: J.S. thanks the School of Chemistry for awarding a PhD Studentship funded by the Engineering and Physical Science Research Council (Grant number 1247175). V.C. gratefully acknowledges the Royal Society and the UK National Academy for the support through the Newton Fellowship program (NF120002). D.T. and D.J.F. are indebted to EPSRC for financial support through the PVTEAM programme (EP/L017792). V.C. and D.J.F. also acknowledge the EPSRC support via the UK Catalysis Hub (EP/K014706/1 and EP014714/1). Electron microscopy studies were performed with equipment funded by EPSRC through the grant “Atoms to Applications” (EP/K035746/1).",

year = "2018",

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doi = "10.1016/j.jelechem.2017.10.024",

language = "English",

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T1 - Photoelectrochemical properties of BiOCl microplatelets

AU - Stephenson, Julie

AU - Celorrio, Veronica

AU - Tiwari, Devendra

AU - Hall, Simon R.

AU - Green, David C.

AU - Fermin, David J.

N1 - Funding information: J.S. thanks the School of Chemistry for awarding a PhD Studentship funded by the Engineering and Physical Science Research Council (Grant number 1247175). V.C. gratefully acknowledges the Royal Society and the UK National Academy for the support through the Newton Fellowship program (NF120002). D.T. and D.J.F. are indebted to EPSRC for financial support through the PVTEAM programme (EP/L017792). V.C. and D.J.F. also acknowledge the EPSRC support via the UK Catalysis Hub (EP/K014706/1 and EP014714/1). Electron microscopy studies were performed with equipment funded by EPSRC through the grant “Atoms to Applications” (EP/K035746/1).

PY - 2018/6/15

Y1 - 2018/6/15

N2 - 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 SO32 − oxidation, while the unexpected negative photocurrents are linked to cathodic material decomposition.

AB - 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 SO32 − oxidation, while the unexpected negative photocurrents are linked to cathodic material decomposition.

UR - https://www.scopus.com/pages/publications/85031432747

U2 - 10.1016/j.jelechem.2017.10.024

DO - 10.1016/j.jelechem.2017.10.024

M3 - Article

SN - 1572-6657

VL - 819

SP - 171

EP - 177

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

ER -

Photoelectrochemical properties of BiOCl microplatelets

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