2D MoS₂/BiOBr van der Waals heterojunctions by liquid-phase exfoliation as photoelectrocatalysts for hydrogen evolution

Abstract

As a semiconductor used for the photocatalytic hydrogen evolution reaction (HER), BiOBr has received intensive attention in recent years. However, the high recombination of photoexcited charge carriers results in poor...

Two-Dimensional Layered Heterojunctions for Photoelectrocatalysis

“…For example, at a BiOBr/MoS 2 HJ, the photogenerated holes and electrons from 2D BiOBr can transfer to the valence band (VB) and CB of 2D MoS 2 , respectively, because of the intrinsic band structure of the two materials. 74 However, the original band position is not the only prerequisite to determine the CT route, as defect states or the internal electric field (IEF) can influence the CT route as well. For instance, the defects or oxygen vacancies on BiOBr can trap part of the photogenerated holes, and thus only part of the holes from BiOBr can transfer to MoS 2 , though the VB of MoS 2 is less positive.…”

“…The two components are combined with vdWs interaction, which is proved by the shift of the MoS2 characteristic peaks in the Raman spectra (Figure 10a). 74 Spin-coating deposition is a common method for ex-situ synthesis of HJs. To fabricate uniform HJs, the suspension of each component should have the desired stability and viscosity.…”

“…For instance, Wang et al tuned the composition of BiOBr and MoS 2 by simply changing the amount ratio of the precursors in the method of LPE. 74 However, achieving precise control over the interface between different components in the HJ can be challenging by wet chemical methods, leading to variations in device performance. Besides, the limited purity and post-treatment of ligands also hinder further applications of the HJ photoelectrocatalysts in practical devices.…”

Nano cocatalyst–catalytic system for boosting photothermal–photocatalytic water treatment enabled by visible LEDs

“…1f and g), respectively, indicating that a heterojunction between FBBov and MoS 2 is efficiently generated. 30,31 Furthermore, the element mappings of FBBov@MoS 2 (1 : 1) are shown in Fig. 1h-n.…”

Mechanical, magnetic and electronic properties of 2D MSX (M = Ti, V, Co and Ni, X = Br and I)

“…Compared with the bulk, the 2D materials can be further manipulated by various methods, such as strain engineering, 24,25 composition modulation, 26,27 surface functionalization, 28 stacking 29 and defect engineering, 30 to achieve the ideal physical properties for targeted applications. Although numerous studies have been conducted on 2D metal oxyhalides in recent years, [13][14][15][16]22,23 research on 2D sulfide halides still remains limited.…”