Vacancy-Rich Monolayer BiO2−x as a Highly Efficient UV, Visible, and Near-Infrared Responsive Photocatalyst
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TLDR
The increased density of states at the conduction band (CB) minimum in the monolayer BiO2-x is responsible for the enhanced photon response and photo-absorption, which were confirmed by UV/Vis-NIR diffuse reflectance spectra (DRS) and photocurrent measurements.Abstract:
Vacancy-rich layered materials with good electron transfer property are of great interesting. Herein, full spectrum responsive vacancy-rich monolayer BiO2-x has been synthesized. The increased density of states at the conduction band (CB) minimum in the monolayer BiO2-x are responsible for the enhanced photon responsibility and photo-absorption, which was confirmed by UV-vis-NIR diffuse reflectance spectra (DRS) and photocurrent measurements. Compared to bulk BiO2-x, monolayer BiO2-x exhibited enhanced photocatalytic performance for rhodamine B and phenol removal under UV, visible and near-infrared light (NIR) irradiation attributed to the vacancy associates VBi-O‴ as confirmed by the positron annihilation spectra. The presence of VBi-O‴ defects in monolayer BiO2-x promoted the separation of electrons and holes. This finding provides an atomic level understanding for developing highly efficient ultraviolet (UV), visible and NIR light responsive photocatalysts.read more
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