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s-p orbital hybridization: a strategy for developing efficient photocatalysts with high carrier mobility

Journal Article


Abstract


  • Photocatalysis has not only invigorated the field of energy conversion

    materials, but also is leading to bright prospects for application

    in the environmental purification field [1]. Akira Fujishima

    and Kenichi Honda [2] first reported photocatalytic water splitting

    on a TiO2 semiconductor electrode under ultraviolet (UV) light in

    1972. In semiconductor photocatalysts, electrons are excited from

    valence band maximum (VBM) to conduction band minimum

    (CBM) under light irradiation, and then trigger the photocatalytic

    process [3]. Considering solar-light-driven photocatalysis, semiconductor

    photocatalysts should possess a narrow band gap and

    appropriate band positions [4]. It was also found that photoinduced

    charge generation, separation, and transportation determine

    activities of semiconductor photocatalysts. High mobility of

    charge carriers facilitates these processes, which can be achieved

    in the photocatalysts with highly dispersive bands, because their

    effective masses of charge carriers are small. Usually, the antibonding

    hybridization/coupling is predominantly responsible for

    the band dispersion, especially for oxides. For example, Sn-5s/O-

    2p anti-bonding coupling in VBM of Sn2+ oxides, Cu-3d/O-2p

    anti-bonding coupling in VBM of Cu+ oxides and anti-bonding coupling

    in CBM of most of semiconductors [5–9]. Especially, s-p orbital

    hybridization is found to improve the performance of

    photocatalysts by affecting their band structures [10,11].

UOW Authors


  •   Xu, Zhongfei (external author)
  •   Xu, Kang (external author)
  •   Feng, Haifeng (external author)
  •   Du, Yi
  •   Hao, Weichang (external author)

Publication Date


  • 2018

Citation


  • Xu, Z., Xu, K., Feng, H., Du, Y. & Hao, W. (2018). s-p orbital hybridization: a strategy for developing efficient photocatalysts with high carrier mobility. Science Bulletin, 63 (8), 465-468.

Scopus Eid


  • 2-s2.0-85045748911

Number Of Pages


  • 3

Start Page


  • 465

End Page


  • 468

Volume


  • 63

Issue


  • 8

Place Of Publication


  • Philippines

Abstract


  • Photocatalysis has not only invigorated the field of energy conversion

    materials, but also is leading to bright prospects for application

    in the environmental purification field [1]. Akira Fujishima

    and Kenichi Honda [2] first reported photocatalytic water splitting

    on a TiO2 semiconductor electrode under ultraviolet (UV) light in

    1972. In semiconductor photocatalysts, electrons are excited from

    valence band maximum (VBM) to conduction band minimum

    (CBM) under light irradiation, and then trigger the photocatalytic

    process [3]. Considering solar-light-driven photocatalysis, semiconductor

    photocatalysts should possess a narrow band gap and

    appropriate band positions [4]. It was also found that photoinduced

    charge generation, separation, and transportation determine

    activities of semiconductor photocatalysts. High mobility of

    charge carriers facilitates these processes, which can be achieved

    in the photocatalysts with highly dispersive bands, because their

    effective masses of charge carriers are small. Usually, the antibonding

    hybridization/coupling is predominantly responsible for

    the band dispersion, especially for oxides. For example, Sn-5s/O-

    2p anti-bonding coupling in VBM of Sn2+ oxides, Cu-3d/O-2p

    anti-bonding coupling in VBM of Cu+ oxides and anti-bonding coupling

    in CBM of most of semiconductors [5–9]. Especially, s-p orbital

    hybridization is found to improve the performance of

    photocatalysts by affecting their band structures [10,11].

UOW Authors


  •   Xu, Zhongfei (external author)
  •   Xu, Kang (external author)
  •   Feng, Haifeng (external author)
  •   Du, Yi
  •   Hao, Weichang (external author)

Publication Date


  • 2018

Citation


  • Xu, Z., Xu, K., Feng, H., Du, Y. & Hao, W. (2018). s-p orbital hybridization: a strategy for developing efficient photocatalysts with high carrier mobility. Science Bulletin, 63 (8), 465-468.

Scopus Eid


  • 2-s2.0-85045748911

Number Of Pages


  • 3

Start Page


  • 465

End Page


  • 468

Volume


  • 63

Issue


  • 8

Place Of Publication


  • Philippines