Ultrathin Two-Dimensional Bi-Based photocatalysts: Synthetic strategies, surface defects, and reaction mechanisms

2D–2D WO3–Bi2WO6 photocatalyst with an S-scheme heterojunction for highly efficient Cr(vi) reduction

“…[5][6][7][8][9] Among two-dimensional (2D)based heterostructures, 2D-2D structures have been found to be the most effective owing to their superior coupling interface, which consequently accelerates the charge migration at the interface. [10][11][12][13][14] Moreover, the development of a 2D-2D structure improves the exposure of reactive sites and switches the optical absorption towards the visible region, which consequently accelerates the photocatalytic performance. 10,15 Another advantage of 2D-2D heterojunction systems is their flexibility and ability to balance the potential of the band edges for photocatalytic reactions in order to meet the required oxidation and reduction potentials of the photocatalyst.…”

Modulating Photon Harvesting Through Constructing Oxygen Vacancies‐Rich 0D/2D Plasmonic Bi/Bismuth Oxybromide Upconversion Nanosheets Toward Improved Solar Photocatalysis

“…The 2D nanosheet structure can provide more reactive sites, shortening the carrier migration distance, and reduce the photogenerated e À /h þ pair recombination rate, which is favorable to improving the catalytic performance. [7] Notably, a lot of Bi nanoclusters can be observed on BiOBr nanosheets with the increased PVP content, as shown in Figure 2a,b. To further analyze the reduced precipitated Bi in BYE/Bi samples, the sample BYE/Bi-3 was selected for high-resolution TEM (HRTEM) characterization (Figure 2c,d).…”

“…Recently, bismuth (Bi)-based photocatalysts were considered as newgeneration materials for visible (vis) light photocatalysis, due to their simple synthesis method, excellent optical absorption properties, appropriate energy band structure, and distinctive electronic structure. [7][8][9][10][11] Among the diverse Bi-based photocatalysts, BiOBr has attracted extensive attention due to its exceptional photocatalytic activity for organic pollutants degradation, CO 2 reduction, N 2 fixation, etc. [12][13][14] However, the photocatalytic property of pure BiOBr is indecisive despite the limitation of low conversion efficiency due to narrow solar light absorption.…”

Cation vacancy activating surface neighboring sites for efficient CO2photoreduction on Bi4Ti3O12nanosheets

“…The construction of a surface defect can introduce a defect level in the forbidden band to increase light absorption, trap photogenerated electrons or holes to promote carrier separation, and provide more reactive sites to reduce CO 2 , which is an efficient surface strategy to simultaneously allay the intrinsic shortcomings of photocatalysts. 13,14 In particular, the latter two advantages brought by surface defects are reported to greatly promote photocatalytic CO 2 activity. For example, Tian et al reported that creating surface S vacancies can trap photogenerated electrons to achieve a shorter carrier migration distance, on which S vacancies enhance the charge separation and further provide sufficient electrons for an effective photocatalysis.…”