CdS Nanorods Coupled with WS₂ Nanosheets for Enhanced Photocatalytic Hydrogen Evolution Activity

Abstract

WS 2 nanosheets−CdS nanorods with heterojunctions were prepared by an ultrasonic/exfoliation method using dimethylformamide as the dispersing agent. CdS nanorods were coupled with small WS 2 nanosheets as a result of exfoliation. An excellent hydrogen production rate of 1222 μmol h −1 (20 mg of catalyst) was achieved over the WS 2 −CdS composite with a WS 2 -to-CdS mass ratio of 1.6:1 under visible-light irradiation (λ ≥ 400 nm). The efficient evolution of hydrogen is attributed to promotion of the separation of photogenerated charge carriers due to the presence of heterojunctions created on the surface.

Efficient Photocatalytic Hydrogen Generation from Water over CdS Nanoparticles Confined Within an Alumina Matrix

“…To obtain further experimental evidence to understand the quantum confinement within the alumina matrix, photoluminescence (PL) spectra were obtained (Figure ). The maximum emission for CdS LDH and CdS is located at 550 nm, which is due to the band–band transition and is consistent with that reported previously . The emission intensity of CdS LDH is much higher than CdS .…”

One-pot hydrothermal synthesis of CdS decorated CuS microflower-like structures for enhanced photocatalytic properties

“…Thiourea (Tu) is considered to easily coordinate with copper (II) ion in aqueous solution owing to the availability of lone pair of electrons on the ligand and free states of metallic ions 4, 22, 55 . Then thiourea-copper (II) complex could serve as Cu 2+ precursors.…”

“…But, CdS is still worthwhile to be used as a photocatalyst due to its narrow band gap of 2.4 eV, endowing it the extremely feasible feature to absorb light irradiation in visible light range 22, 24, 29 . Therefore, many efforts have been made to overcome the aforementioned disadvantages and various nanostructured CdS materials had been synthesized, such as nanorods 23 , nanoflowers 23 , nanospheres 24 , nanotubes 37 , nanowires 38, 39 , nanosheets 40 , nanocone and nanofrustum 41 etc .…”

CdSe Quantum Dots Doped WS2 Nanoflowers for Enhanced Solar Hydrogen Production

“…Heterogeneous photocatalytic water splitting for hydrogen evolution has been widely studied and has become a promising approach for highly efficient hydrogen production . Various oxides, sulfides, and quantum dots (QDs) have been developed and studied for the improvement of photocatalytic activity . Recently, semiconductor nanocrystals (specifically QDs) have emerged as a visible‐light‐driven photocatalyst and have received increasing attention.…”