Heterointerface Engineering of ZnO/CdS Heterostructures through ZnS Layers for Photocatalytic Water Splitting

Abstract

Solar-driven water splitting to produce clean and renewable hydrogen offers a green strategy to address the energy crisis and environmental pollution. Heterostructure catalysts are receiving increasing attention for photocatalytic hydrogen generation. ZnO/ZnS/CdS and ZnO/CdS heterostructures have been successfully designed and prepared according to two different strategies. By introducing a heterointerface layer of ZnS between ZnO and CdS, a Z scheme charge-transfer channel was promoted and achieved superior photocatalytic performance. A highest hydrogen generation rate of 156.7 μmol g À 1 h À 1 was achieved by precise control of the thickness of the heterointerface layer and of the CdS shell. These findings demonstrated that heterostructures are promising catalysts for solar-driven water splitting, and that heterointerface engineering is an effective way to improve the photocatalytic properties of heterostructures.

Interfacial electric field construction of hollow PdS QDs/Zn1−xCdxS solid solution with enhanced photocatalytic hydrogen evolution

“…3d) can be fitted to two peaks whose binding energy is 162.52 and 161.34 eV, which corresponded to S 2p 1/2 and S 2p 3/2 . 38 It's obviously that the bind energy of Cd 3d 3/2 and Cd 3d 5/2 of Zn 0.6 Cd 0.4 S solid solution shifted to higher binding energy. Similarly, the binding energy of Zn 3d 5/2 and Zn 3d 3/2 still shifted towards higher.…”

Construction of Ag/Ag2S/CdS Heterostructures through a Facile Two-Step Wet Chemical Process for Efficient Photocatalytic Hydrogen Production

“…In addition, the formation of Ag/Ag 2 S/CdS heterostructures through the reaction of Ag nanowires and CdS precursors was found to be more favorable for the transfer of electron–hole pairs, leading to improved efficiency of photocatalytic water splitting for hydrogen generation. Furthermore, the Ag/Ag 2 S/CdS heterostructures exhibit higher HER values compared to other reported studies, including flower-like ZnO/Au/CdS nanorods [ 42 ], ZnO/ZnS/CdS heterostructures [ 43 ], Ag-based g-C 3 N 4 composites [ 44 ], Cu 2 O/CuS/ZnS nanocomposite [ 38 ], and CdS/Pt-N-TiO 2 nanocatalysts [ 45 ].…”

In Situ Preparation of 0D/2D Zn-Ag-In-S Quantum Dots/RGO Heterojunctions for Efficient Photocatalytic Hydrogen Production

“…The two peaks appearing at 161.6 and 162.8 eV in Figure 4e could be attributed to both pure QDs and ZAIS QDs-30 μL RGO, as both of them correspond to S 2p3/2 and S 2p1/2. These two peaks show a slight blue shift of 0.2 eV in the case of ZAIS QDs-30 μL RGO, appearing at 161.8 and 163.0 eV, respectively [38,39]. The change in the XPS peak is mainly due to the decrease in the electron cloud density on the surface of the composite photocatalysts, XPS measurements were carried out for further analysis of the electronic state and chemical composition of the prepared photocatalysts.…”