Construction of 3d/0d Sv-Res2/Zncds Hierarchical Structure with Improved Interfacial Charge Transfer for Enhanced Photocatalytic Hydrogen Evolution

Abstract

The fast carrier complexation rate and the low utilization efficiency of photogenerated electrons are the most important factors affecting the performances of photocatalysts. In this paper, 3D globular ReS2 with S defects and unique three-exciton properties are combined with 0D ZnCdS nanoparticles to construct a 3D/0D Sv-ReS2/ZnCdS hierarchical structure. It is demonstrated by PL, IT and TPV characterization that the constructed ReS2/ZnCdS materials have superior interfacial electron transfer, which can effectively inhibit carrier complexation and enhance the separation efficiency of carriers. Meanwhile, 15wt% ReS2/ZnCdS exhibited a photocatalytic hydrogen production performance of 7295 μmol/g/h, which is 3.5 times than that of single ZnCdS photocatalyst (2103 μmol/g/h). The 3D spherical ReS2 with S defects and unique three-exciton properties can provide more active sites for photocatalytic reactions and establish two-electron catalytic reactions, and the close-contact heterojunction interfaces formed within ZnCdS and ReS2 can also effectively promote the separation and transfer of electrons and holes. This paper provides some ideas for the rational use of cocatalysts to construct high-performance photocatalysts with excellent interfacial electron transfer.

Keywords: Interfacial charge transfer, sulfur defects, Sv-ReS2/ZnCdS hierarchical structure, photocatalytic hydrogen evolution