Constructing a MoS2 QDs/CdS Core/Shell Flowerlike Nanosphere Hierarchical Heterostructure for the Enhanced Stability and Photocatalytic Activity

Abstract

MoS 2 quantum dots (QDs)/CdS core/shell nanospheres with a hierarchical heterostructure have been prepared by a simple microwave hydrothermal method. The as-prepared samples are characterized by XRD, TEM, SEM, UV-VIS diffuse reflectance spectra (DRS) and N 2 -sorption in detail. The photocatalytic activities of the samples are evaluated by water splitting into hydrogen. Results show that the as-prepared MoS 2 QDs/CdS core/shell nanospheres with a diameter of about 300 nm are composed of the shell of CdS nanorods and the core of MoS 2 QDs. For the photocatalytic reaction, the samples exhibit a high stability of the photocatalytic activity and a much higher hydrogen evolution rate than the pure CdS, the composite prepared by a physical mixture, and the Pt-loaded CdS sample. In addition, the stability of CdS has also been greatly enhanced. The effect of the reaction time on the formations of nanospheres, the photoelectric properties and the photocatalytic activities of the samples has been investigated. Finally, a possible photocatalytic reaction process has also been proposed.

2D–Materials‐Based Quantum Dots: Gateway Towards Next‐Generation Optical Devices

“…In MoS 2 , band‐gap tuning from an indirect band gap in bulk form to a direct gap in semiconductor form can be achieved by tuning the numbers of layers and quantum confinement resulting from band gap transition in d‐orbital‐related interaction gives rise to photoluminescence (PL) . MoS 2 can be an efficient catalyst when combine with semiconductors like TiO 2 and CdS . It was reported that MoS 2 QDs have the excitation dependent PL with wavelengths in the range of 400–600 nm.…”

Ag2S quantum dots in situ coupled to hexagonal SnS2 with enhanced photocatalytic activity for MO and Cr(vi) removal

“…Among a large variety of semiconductor photocatalysts, tin disulde (SnS 2 ), a peculiar CdI 2 -structure metal-sulde semiconductor, depend on its excellent oxidation resistance, splendid thermal stability in the air and non-toxicity, low cost, [10][11][12][13][14][15] has been in-depth investigated and widely applied in the photocatalysis eld involving reduction of CO 2 , 16 reduction of Cr(VI), 17 degradation of organic compounds, 18 and production of H 2 from water. 19 As the research goes on, different morphologies of SnS 2 nanomaterials have been obtained (such as nanoowers, 20 nanotubes, 21 nanorods, 22 and nanoplates 23 ) to produce higher specic area or control the band gap energies.…”

Carbon Cloth‐supported MoS2/Ag2S/Ag3PO4 Composite with High Photocatalytic Activity and Recyclability

“…[1][2][3] Wastewater containing such organic dyes will lead to severe environmental pollution. Organic dyes such as rhodamine B (RhB), particularly, have been widely used in some chemical industries we are using in our daily life.…”

“…Organic dyes such as rhodamine B (RhB), particularly, have been widely used in some chemical industries we are using in our daily life. [1][2][3] Wastewater containing such organic dyes will lead to severe environmental pollution. Photocatalysis has been proved to be an effective method that can degrade organic contaminants in the wastewater using solar energy.…”