Liquid-Phase Exfoliation into Monolayered BiOBr Nanosheets for Photocatalytic Oxidation and Reduction

Abstract

Monolayered photocatalytic materials have attracted huge research interests in terms of their large specific surface area and ample active sites. Sillén-structured layered BiOX (X = Cl, Br, I) casts great prospects owing to their strong photo-oxidation ability and high stability. Fabrication of monolayered BiOX by a facile, low-cost, and scalable approach is highly challenging and anticipated. Herein, we describe the large-scale preparation of monolayered BiOBr nanosheets with a thickness of ∼0.85 nm via a readily achievable liquid-phase exfoliation strategy with assistance of formamide at ambient conditions. The as-obtained monolayered BiOBr nanosheets are allowed diverse superiorities, such as enhanced specific surface area, promoted band structure, and strengthened charge separation. Profiting from these benefits, the advanced BiOBr monolayers not only show excellent adsorption and photodegradation performance for treating contaminants, but also demonstrate a greatly promoted photocatalytic activity for CO2 reduction into CO and CH4. Additionally, monolayered BiOI nanosheets have also been obtained by the same synthetic approach. Our work offers a mild and general approach for preparation of monolayered BiOX, and may have huge potential to be extended to the synthesis of other single-layer two-dimensional materials.

Three‐in‐One Oxygen Vacancies: Whole Visible‐Spectrum Absorption, Efficient Charge Separation, and Surface Site Activation for Robust CO2 Photoreduction

“…This is because the presence of OVs promotes the adsorption of H 2 Om olecules on the surface of catalysts. [11] As aresult, the H 2 Oadsorbed amount tops at SBNT-HR-1 with the highest OVsc oncentration.…”

Synthesis of Large‐Area Atomically Thin BiOI Crystals with Highly Sensitive and Controllable Photodetection

“…Bismuth oxyhalides (BiOX, X = Cl, Br, and I), as representative layered materials in ternary compound library, have been studied as photocatalysts due to their favorable band structures and high capability of absorbing sunlight to carry out photocatalytic reactions . As a group of V–VI–VII ternary compounds, BiOX exhibit tetragonal matlockite structure (PbFCl‐type) with P 4/ nmm space group .…”

Modulation of Bi2MoO6‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

“…can weaken the interaction between adjacent layers of van der Waals‐layered crystals, and thereby the ultrathin nanosheets are obtained by the cleavage along the layer plane . Plenty of atomically thin 2D materials have been successfully achieved via top‐down methods, such as monolayered BiOBr nanosheets by formamide‐assisted exfoliation, ultrathin Bi 12 O 17 Cl 2 nanosheets by the photoassisted Ag exfoliation method, ultrathin Ti 3 C 2 nanosheets by dimethyl sulfoxide‐intercalation assisted ultrasonic exfoliation, etc. However, some shortages including low yield, uncontrollable layer number and only suitable for layered materials have gradually hindered the development.…”