Fabrication of Wide-Range-Visible Photocatalyst Bi2WO6-x nanoplates via Surface Oxygen Vacancies

Scientific Reports
Yanhui LvYongfa Zhu

Abstract

Bi2WO6 as a high visible-light-driven catalyst has been aroused broad interest. However, it can only be excitated by the light with λ < 450 nm and the solar energy utilization need to be improved. Here, the wide-range-visible photoresponse Bi2WO6-x nanoplates were fabricated by introducing surface oxygen vacancies through the controllable hydrogen reduction method. The visible photoresponse wavelength range is extended from 450 nm to more than 600 nm. In addition, the photocatalytic activity of Bi2WO6-x is also increased and is 2.1 times as high as that of pristine Bi2WO6. The extending of the photoresponse range and the enhancement of the photoactivity both can be attributed to the surface-oxygen-vacancy states. This is because surface-oxygen-vacancy states generated above and partly overlapping of with the valence band (VB) will result in the rising of valence band maximum (VBM), thus broadening the VB width. This approach is proposed to develop many types of wide-range-visible optical materials and to be applicable to many narrow and wide bandgap materials.

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Citations

Oct 14, 2016·Scientific Reports·Haipeng ChuChangqing Sun
Jun 15, 2017·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Zhijie ZhangNa Zhang
Aug 11, 2019·Scientific Reports·Daniel R JonesCharles W Dunnill
Nov 20, 2016·Chemistry : a European Journal·Yuchen HaoXiufang Zhang
Jun 24, 2017·Scientific Reports·Daniel R JonesCharles W Dunnill
Jan 12, 2021·Environmental Science & Technology·Yongguang BuBingcai Pan
Apr 15, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Jinwu BaiMin Fu
Jul 20, 2018·ACS Omega·Alok P JakhadeRajeev C Chikate
Apr 3, 2020·ACS Applied Materials & Interfaces·Sujuan WuMatthew F Chisholm
Oct 24, 2019·Environmental Science & Technology·Wei HongFangxia Shen
Aug 11, 2020·Journal of Colloid and Interface Science·Muhammad ArifShen-Ming Chen

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Methods Mentioned

BETA
x-ray photoelectron spectroscopy
X-ray
electron paramagnetic resonance
light scattering

Software Mentioned

XPSpeak

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