Skip to main content
placeholder image

The Dependence of Bi2MoO6 Photocatalytic Water Oxidation Capability on Crystal Facet Engineering

Journal Article


Abstract


  • Crystal facet engineering of semiconductor photocatalysts is

    regarded as an emerging strategy to tune their physicochemical

    properties and optimize the photoreactivity of the materials. In

    this work, two plate-like Bi2MoO6 samples were prepared,

    dominant in either the distinctly different {100} or {010} facets.

    As a consequence of the electronic structure effects induced by

    the facets, the {100}-dominant Bi2MoO6 (100-BMO) possessed a

    smaller band gap and delivered a much higher photocatalytic

    water oxidation activity than {010}-dominant Bi2MoO6 (010-

    BMO). A greater charge carrier density in 100-BMO was found

    to promote electron accumulation on the {100} surfaces,

    leading to the narrower band gap, as supported by Mott-

    Schottky measurements. Efficient intrinsic electron-hole separation

    and longer charge carrier lifetimes in 100-BMO were also

    observed. Further, a higher photocurrent density and smaller

    Nyquist plot arc radius presented by 100-BMO imply a higher

    charge transfer capacity. EPR analysis indicated that the 100-

    BMO boasted a higher oxygen vacancy density, whereby the

    vacancies could serve as shallow donors to trap electrons and

    suppress photogenerated electron-hole pair recombination.

    Overall, the {100} facet in Bi2MoO6 delivered a mix of distinctly

    advantageous characteristics relative to the {010} facet with the

    findings clearly illustrating the value of crystal facet engineering

    in boosting photocatalytic performance.

Authors


  •   Wu, Xuelian (external author)
  •   Ng, Yun Hau (external author)
  •   Saputera, Wibawa (external author)
  •   Wen, Xiaoming (external author)
  •   Du, Yi
  •   Dou, Shi Xue
  •   Amal, Rose (external author)
  •   Dr Jason Scott, Jason (external author)

Publication Date


  • 2019

Citation


  • Wu, X., Ng, Y., Saputera, W. H., Wen, X., Du, Y., Dou, S. Xue., Amal, R. & Scott, J. (2019). The Dependence of Bi2MoO6 Photocatalytic Water Oxidation Capability on Crystal Facet Engineering. Chemphotochem, Online First

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3917

Volume


  • Online First

Place Of Publication


  • Germany

Abstract


  • Crystal facet engineering of semiconductor photocatalysts is

    regarded as an emerging strategy to tune their physicochemical

    properties and optimize the photoreactivity of the materials. In

    this work, two plate-like Bi2MoO6 samples were prepared,

    dominant in either the distinctly different {100} or {010} facets.

    As a consequence of the electronic structure effects induced by

    the facets, the {100}-dominant Bi2MoO6 (100-BMO) possessed a

    smaller band gap and delivered a much higher photocatalytic

    water oxidation activity than {010}-dominant Bi2MoO6 (010-

    BMO). A greater charge carrier density in 100-BMO was found

    to promote electron accumulation on the {100} surfaces,

    leading to the narrower band gap, as supported by Mott-

    Schottky measurements. Efficient intrinsic electron-hole separation

    and longer charge carrier lifetimes in 100-BMO were also

    observed. Further, a higher photocurrent density and smaller

    Nyquist plot arc radius presented by 100-BMO imply a higher

    charge transfer capacity. EPR analysis indicated that the 100-

    BMO boasted a higher oxygen vacancy density, whereby the

    vacancies could serve as shallow donors to trap electrons and

    suppress photogenerated electron-hole pair recombination.

    Overall, the {100} facet in Bi2MoO6 delivered a mix of distinctly

    advantageous characteristics relative to the {010} facet with the

    findings clearly illustrating the value of crystal facet engineering

    in boosting photocatalytic performance.

Authors


  •   Wu, Xuelian (external author)
  •   Ng, Yun Hau (external author)
  •   Saputera, Wibawa (external author)
  •   Wen, Xiaoming (external author)
  •   Du, Yi
  •   Dou, Shi Xue
  •   Amal, Rose (external author)
  •   Dr Jason Scott, Jason (external author)

Publication Date


  • 2019

Citation


  • Wu, X., Ng, Y., Saputera, W. H., Wen, X., Du, Y., Dou, S. Xue., Amal, R. & Scott, J. (2019). The Dependence of Bi2MoO6 Photocatalytic Water Oxidation Capability on Crystal Facet Engineering. Chemphotochem, Online First

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3917

Volume


  • Online First

Place Of Publication


  • Germany