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Abstract 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.
Li et al. (Fri,) studied this question.