Rapid Microwave‐Assisted Synthesis of CdS/Graphene/MoS_x Tunable Heterojunctions and Their Application in Photocatalysis

Abstract

Nanoscale two-dimensionaln anostructures have shown great potential as functional components in photocatalysis. Here, investigationso nt he synthesis of heterostructured hybrids, comprised of 0D CdS nanoparticles as semiconductor and 2D/2D graphene/MoS x as co-catalyst, are reported. The approach involves ar apid microwave-assisted reaction in autoclave conditions, by adopting either ao nestep or at wo-stepp rotocol. The chemical speciation of the nanocomposites was found to depend strongly on the compounding conditions of the precursors ubstances. The pho-tocatalytic activity was assessed by monitoring the photodegradation rate of 4-nitrophenol in solution using simulated solar light irradiation. The photocatalytic activity of the hybrids may be attributed to ac ombination of beneficial characteristics, strongly relatedt ot he chemical speciationo ft he composite components. Moreover,i ntimate contacts of the latter result in efficient heterojunctions. Overall, the present study provides valuable insighti nto the development of functional heterostructured photocatalystsc omprised of two-dimensional nanomaterials. Figure 5. Raman spectrafrom (a) MoGr@CdS and (b) CdS@MoGrt ernary hybrids at low laser dose (0.02 mW).

2D PbS Nanosheets with Zigzag Edges for Efficient CO2 Photoconversion

“…Similar was the shape of the bulk PbS peaks and higher binding energy (142.6 and 137.7 eV) for the bulk PbS. For the S spectra of the e‐PbS, in addition to the binding energies of 160.8 and 159.6 eV for S 2p 1/2 and S 2p 3/2 , a sulfur‐oxide bonding peak was observed in the region of 166.6 eV, respectively [11b,c] . Another two additional peaks observing from 164.2 and 163.2 eV were also presented (Figure S4 b), and were assigned to the binding energies of apical sulfur (S 2− ) or bridging disulfide ligands (S 2 2− ), indicating that the unsaturated S atom, which were regarded as defect active sites of edges structures in the e‐PbS NS [11] .…”

Identification of the Charge Transfer Channel in Cobalt Encapsulated Hollow Nitrogen‐Doped Carbon Matrix@CdS Heterostructure for Photocatalytic Hydrogen Evolution

“…41–1049). [ 22 ] The peaks of NC@Co‐NCT/CdS are consistent with CdS, which may be ascribed to the overlap of peaks. TEM mapping and X‐ray photoelectron spectroscopy (XPS) can confirm the presence of NC@Co‐NCT species.…”

Synthesis and Characterization of Amorphous Molybdenum Sulfide (MoSx)/CdIn2S4 Composite Photocatalyst: Co-Catalyst Using in the Hydrogen Evolution Reaction

“…Due to this, the deposition of amorphous molybdenum sulfides has proven to be a promising way to improve photocatalytic hydrogen production. MoS x not only offers electron transport channels that promote the separation of electron-hole pairs, but also act as active reaction sites [21][22][23]. MoS x is a noble-metal-free material whose hydrogen evolution activity is better than that of MoS 2 .…”