Mixed-dimensional 1D CdS/2D MoSe2 heterostructures for high-performance photocatalytic hydrogen production

Molecular Engineering Strategies toward Molybdenum Diselenide Design for Energy Storage and Conversion

“…[257][258][259][260][261][262] In particular, although pristine MoSe 2 presents desirable semiconducting properties with a narrow bandgap of ≈1.33-1.72 eV and the largest carrier mobility ratio among group VIB TMDs, which significantly promotes the separation of electron-hole pairs), [263] rendering it a suitable photocatalyst. However, its inefficient light absorption, sluggish charge transfer process, and rapid recombination of electronhole pairs hindered its use in industrial applications, while it can be served as cocatalysts to collaborate with other conventional photosensitizers, including TiO 2 , [264][265][266] CdS, [33,[267][268][269] g-C 3 N 4 , [270,271] metal oxides, [272,273] and other TMDs [274][275][276] via interfacial engineering or structural engineering (Figure 22 and Table 9). By coupling with these semiconductors, favorable Schottky junctions (self-built-in electric fields) can form at the interfaces, which effectively accelerate the separation of photoexcited electron-hole pairs and improve photocatalytic performances.…”

Surface Defect-Driven Chemical Transformation of MoSe2 Nanosheets

“…Our group recently developed the ways to utilize the defects of MoSe 2 NSs to tune the optoelectronic as well as electrocatalytic properties via making NHSs. − The defects of MoSe 2 NSs are advantageous for surface modification, as molecules such as thiol can easily make bonds with unsaturated Mo edges and hence functionalize their surface for further chemical transformation. , Using this concept of surface modification with thiol moieties, we designed various NHSs, e.g., MoSe 2 –Cu 2 S, MoSe 2 –SnS, and MoSe 2 –CsPbBr 3 . − It is still in high demand to design new NHSs with suitable counterparts to obtain desired properties. CdS crystallizes in the same crystal symmetry as of hexagonal MoSe 2 , , which opens the possibility of making NHSs using these two materials. CdS possesses appealing optical properties, e.g., band gap tunability, good photostability, and compatibility with solution processing methods, and forms type-II band alignment with MoSe 2 .…”

“…CdS crystallizes in the same crystal symmetry as of hexagonal MoSe 2 , , which opens the possibility of making NHSs using these two materials. CdS possesses appealing optical properties, e.g., band gap tunability, good photostability, and compatibility with solution processing methods, and forms type-II band alignment with MoSe 2 . Furthermore, it absorbs in different spectral regions, which may result in a widening of the absorbance window …”

“…25−27 It is still in high demand to design new NHSs with suitable counterparts to obtain desired properties. CdS crystallizes in the same crystal symmetry as of hexagonal MoSe 2 , 28,29 which opens the possibility of making NHSs using these two materials. CdS possesses appealing optical properties, e.g., band gap tunability, good photostability, and compatibility with solution processing methods, and forms type-II band alignment with MoSe 2 .…”

“…CdS possesses appealing optical properties, e.g., band gap tunability, good photostability, and compatibility with solution processing methods, and forms type-II band alignment with MoSe 2 . 28 Furthermore, it absorbs in different spectral regions, which may result in a widening of the absorbance window. 29 Along with the defect passivation using thiol moieties, it could be also interesting to study the chemical transformation upon direct exposure of the metal cation in defect-rich MoSe 2 NSs.…”