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Improving the photo-oxidative capability of BiOBr via crystal facet engineering

Journal Article


Abstract


  • Bismuth oxybromide (BiOBr) has emerged as a potential visible-light-driven photocatalyst with relatively high photocatalytic activity although modifications are still necessary to further promote its photocatalytic performance. Here, a facile chemical precipitation process was used to synthesize tetragonal BiOBr with a predominance of either {001} or {010} exposed crystal facets. Scanning electron microscopy revealed that BiOBr particles dominated by the {010} facet possessed a large plate-like morphology while the {001}-dominated BiOBr comprised smaller, more irregular particles. Ultraviolet-visible diffuse reflectance spectra and Mott–Schottky analysis highlighted a difference in electronic band structure of the two materials; BiOBr-010 possessed a valence band potential and a band-gap of 2.71 and 2.95 eV versus normal hydrogen electrode (NHE), respectively, while BOBr-001 exhibited values of 2.63 and 3.15 eV versus NHE, respectively. BiOBr-010 displayed a better photo-oxidative capability than BOBr-001 for both water oxidation and formic acid degradation (aqueous phase). The higher photo-oxidative capability of BiOBr-010 was attributed to the suppression of photo-induced electron/hole recombination. Additionally, the improved charge transfer efficiency and reduced charge transfer resistance in BiOBr-010 was revealed to be beneficial for enhancing photoelectrochemical (PEC) performance. The findings account for the better photo-oxidative activity and higher current density of BiOBr-010 despite its smaller specific surface area and illustrate the use of crystal facet engineering to promote photocatalytic performance.

Authors


  •   Wu, Xuelian (external author)
  •   Ng, Yun Hau (external author)
  •   Wang, Liang (external author)
  •   Du, Yi
  •   Dou, Shi Xue
  •   Amal, Rose (external author)
  •   Dr Jason Scott, Jason (external author)

Publication Date


  • 2017

Citation


  • Wu, X., Ng, Y., Wang, L., Du, Y., Dou, S. Xue., Amal, R. & Scott, J. (2017). Improving the photo-oxidative capability of BiOBr via crystal facet engineering. Journal Of Materials Chemistry A, 5 (17), 8117-8124.

Scopus Eid


  • 2-s2.0-85021924371

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2521

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 8117

End Page


  • 8124

Volume


  • 5

Issue


  • 17

Place Of Publication


  • United Kingdom

Abstract


  • Bismuth oxybromide (BiOBr) has emerged as a potential visible-light-driven photocatalyst with relatively high photocatalytic activity although modifications are still necessary to further promote its photocatalytic performance. Here, a facile chemical precipitation process was used to synthesize tetragonal BiOBr with a predominance of either {001} or {010} exposed crystal facets. Scanning electron microscopy revealed that BiOBr particles dominated by the {010} facet possessed a large plate-like morphology while the {001}-dominated BiOBr comprised smaller, more irregular particles. Ultraviolet-visible diffuse reflectance spectra and Mott–Schottky analysis highlighted a difference in electronic band structure of the two materials; BiOBr-010 possessed a valence band potential and a band-gap of 2.71 and 2.95 eV versus normal hydrogen electrode (NHE), respectively, while BOBr-001 exhibited values of 2.63 and 3.15 eV versus NHE, respectively. BiOBr-010 displayed a better photo-oxidative capability than BOBr-001 for both water oxidation and formic acid degradation (aqueous phase). The higher photo-oxidative capability of BiOBr-010 was attributed to the suppression of photo-induced electron/hole recombination. Additionally, the improved charge transfer efficiency and reduced charge transfer resistance in BiOBr-010 was revealed to be beneficial for enhancing photoelectrochemical (PEC) performance. The findings account for the better photo-oxidative activity and higher current density of BiOBr-010 despite its smaller specific surface area and illustrate the use of crystal facet engineering to promote photocatalytic performance.

Authors


  •   Wu, Xuelian (external author)
  •   Ng, Yun Hau (external author)
  •   Wang, Liang (external author)
  •   Du, Yi
  •   Dou, Shi Xue
  •   Amal, Rose (external author)
  •   Dr Jason Scott, Jason (external author)

Publication Date


  • 2017

Citation


  • Wu, X., Ng, Y., Wang, L., Du, Y., Dou, S. Xue., Amal, R. & Scott, J. (2017). Improving the photo-oxidative capability of BiOBr via crystal facet engineering. Journal Of Materials Chemistry A, 5 (17), 8117-8124.

Scopus Eid


  • 2-s2.0-85021924371

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2521

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 8117

End Page


  • 8124

Volume


  • 5

Issue


  • 17

Place Of Publication


  • United Kingdom