A Initiative Intercalating Strategy for Conversion of Bi₂O₃to Bi₂O₂[BO₂(OH)] and Double Internal Electric Field-Dependent Photoelectrochemistry Properties

Abstract

Herein, we, for the first time, have developed a facile anion intercalation method to prepare uniform Bi2O2[BO2(OH)]/Bi2O3 and Bi2O2[BO2(OH)] nanosheets, in which H2O2 is employed as the exfoliating reagent to break the weak Bi−O bonds (2.572 Å) between [Bi2O2]n2n+ layers, then allowing borate ion to precisely intercalate into [Bi2O2]n2n+ layers. Further, density functional theory (DFT) calculations reveal that both O 2p and B 2p of [BO3]3− layer obviously contribute to an downshift of valence band (VB) and upshift of conduction band (CB), leading to a wider band gap of Bi2O2[BO2(OH)]. Thus, Bi2O2[BO2(OH)]/Bi2O3 exhibit a higher photocatalytic activity than Bi2O3 for the degradations of rhodamine B (RhB) under ultraviolet light irradiation (λ < 420 nm), which may be resultant from a synergetic effect of double internal electronic field that has improved charge separation efficiency. For featured layered materials, anion intercalation is an artful facile strategy to develop new, efficient photocatalysts.

Electrospinning Preparation and Formation Mechanism of BiVO4/α, β‐Bi2O3 Nanofibers with Enhanced Photocatalytic Properties

“…It is well known that β ‐Bi 2 O 3 has a lower band gap energy and high optical absorption in the visible‐light region, so the photocatalytic activity of β ‐Bi 2 O 3 is higher than that of α ‐Bi 2 O 3 . However, visible light can be absorbed by pure Bi 2 O 3 , and the recombination efficiency of photogenerated carries is high in the single catalyst, and this limits the application and generalization of Bi 2 O 3 in the field of photocatalysis. Therefore, many visible‐light‐driven photocatalysts consisting of Bi 2 O 3 and the material with suitable band gaps, such as FeVO 4 , TiO 2 , BiOX, SrTiO 3 , NiFe 2 O 4 , Au/FeVO 4 , ZnO, and Bi 2 S 3 /Bi 2 O 2 CO 3 , have been explored to solve this problem.…”

Covalently Bonded Bi2O3 Nanosheet/Bi2WO6 Network Heterostructures for Efficient Photocatalytic CO2 Reduction

“…RESULTS AND DISCUSSIONFigure1aillustrates the single-step hydrothermal synthetic process of the Bi 2 O 3 /Bi 2 WO 6 heterostructure and the corresponding crystal structure. As shown in the atom structure, the layered structure Bi 2 WO 6 is constructed by [Bi 2 O 2 ] layers and corner-shared WO 6 octahedral layers.32−34 The structure of the [Bi 2 O 2 ] layer in Bi 2 WO 6 is similar to the structure of Bi 2 O 3 , which is a Bi−O tetrahedral configuration 35.…”