Synthesis of CdS/MoS₂ Nanooctahedrons Heterostructure with a Tight Interface for Enhanced Photocatalytic H₂ Evolution and Biomass Upgrading

Abstract

With the depletion of fossil fuels and environmental contamination, photocatalytic H2 production has become an essential issue. Co‐catalysts play a critical role in improving photocatalytic H2 generation of photocatalysts. However, co‐catalysts frequently need additional synthesis steps for loading on the surface of photocatalysts, and the interface contact between the co‐catalyst and the photocatalyst is insufficient. Herein, a CdS/MoS2 nanooctahedron heterostructure is prepared through the in situ sulfidation of CdMoO4 nanooctahedrons. MoS2 as the co‐catalyst provides active sites for H2 generation and enhances the separation of photo‐generated carriers. Furthermore, the sulfidation of CdMoO4 precursors ensures a tight contact interface by S atoms between CdS and MoS2, which is beneficial to the electrons transfer from CdS to MoS2, thus markedly improving the photocatalytic H2 evolution activity. The obtained optimum CdS/MoS2 nanooctahedrons exhibit a better photocatalytic H2 generation activity than those of pure CdS, pure MoS2, and even CdS/MoS2 by hydrothermal synthesis under visible light irradiation. In addition, solar‐driven biomass upgrading of furfural alcohol, bacterial cellulose membrane, bioplastic wastes upgrading of polylactic acid (PLA), polyethylene terephthalate (PET), and their reforming to H2 are also performed and demonstrate an inexpensive route to drive aqueous proton reduction to H2 through waste biomass oxidation.

Few‐Layered MoxW1−xS2‐Modified CdS Photocatalyst: One‐Step Synthesis with Bifunctional Precursors and Improved H2‐Evolution Activity

“…As is well known, a strongly coupled interface can make great contribution to the speedy transit of photoinduced electrons from host photocatalyst to H 2 ‐evolution cocatalyst. [ 45,46 ] Thus, it is of paramount significance to develop the high‐performance H 2 ‐evolution Mo x W 1− x S 2 cocatalysts and exploit their valid synthesis method to construct Mo x W 1− x S 2 ‐modified photocatalyst with strongly coupled interface for the further development of the robust cocatalyst‐modified photocatalytic materials.…”

Surface‐Activated Ti3C2TxMXene Cocatalyst Assembled with CdZnS‐Formed 0D/2D CdZnS/Ti3C2‐A40Schottky Heterojunction for Enhanced Photocatalytic Hydrogen Evolution

“…All peaks of the corresponding elements such as Ti, C, O, F, N, Cd, Zn, and S were detected in full survey spectra. In Cd 3 d high‐resolution XPS spectra (in Figure 4b), the Cd 3 d 5/2 and 3 d 3/2 orbitals of CZS were detected at 404.2 and 411.0 eV, confirming the existence of Cd 2+ , [ 38 ] respectively, and shifted to higher binding energies of 404.9 and 411.7 eV in CZS/Ti 3 C 2 ‐A 40 . High‐resolution Zn 3 d spectrum of CZS redshift about 0.7 eV in CZS/Ti 3 C 2 ‐A 40 , from 10.3 eV shift to 11.0 eV in Figure 4c.…”

Recent Advancements in Photocatalytic Valorization of Plastic Waste to Chemicals and Fuels

“…Owing to that the bare semiconductor photocatalysts generally suffers from lack of surface active sites, and rapid recombination of photogenerated charge carriers, thus limiting the overall photocatalytic performance (Majeed et al, 2016;Shi et al, 2018 2A,B) (Zhao et al, 2020). This in-situ synthesis method forms a close and sufficient S atomic contact interface between CdS and MoS 2 , which is conductive to the transfer of electrons from CdS to MoS 2 .…”