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Vacancy‐Rich Monolayer BiO 2− x as a Highly Efficient UV, Visible, and Near‐Infrared Responsive Photocatalyst
Author(s) -
Li Jun,
Wu Xiaoyong,
Pan Wenfeng,
Zhang Gaoke,
Chen Hong
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201708709
Subject(s) - monolayer , rhodamine b , photochemistry , visible spectrum , vacancy defect , photocurrent , photocatalysis , materials science , irradiation , band gap , absorption spectroscopy , absorption (acoustics) , chemistry , infrared , optoelectronics , nanotechnology , crystallography , optics , organic chemistry , physics , catalysis , nuclear physics , composite material
Vacancy‐rich layered materials with good electron‐transfer property are of great interest. Herein, a full‐spectrum responsive vacancy‐rich monolayer BiO 2− x has been synthesized. The increased density of states at the conduction band (CB) minimum in the monolayer BiO 2− 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. Compared to bulk BiO 2− x , monolayer BiO 2− x has exhibited enhanced photocatalytic performance for rhodamine B and phenol removal under UV, visible, and near‐infrared light (NIR) irradiation, which can be attributed to the vacancy V Bi‐O ′′′ as confirmed by the positron annihilation spectra. The presence of V Bi‐O ′′′ defects in monolayer BiO 2− x promoted the separation of electrons and holes. This finding provides an atomic level understanding for developing highly efficient UV, visible, and NIR light responsive photocatalysts.