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Smart Hybridization of Au Coupled CdS Nanorods with Few Layered MoS 2 Nanosheets for High Performance Photocatalytic Hydrogen Evolution Reaction

2018; American Chemical Society; Volume: 6; Issue: 5 Linguagem: Inglês

10.1021/acssuschemeng.8b00249

2168-0485

Rama Krishna Chava, Jeong Yeon, Misook Kang,

Chalcogenide Semiconductor Thin Films

Fabrication of core–shell heteronanostructures with excellent optical properties and light induced charge separation effects have recently emerged as promising materials for solar to hydrogen conversion. Here, one-dimensional CdS–Au/MoS2 hierarchical core/shell heteronanostructures (CSHNSs) have been successfully synthesized by a facile two-step hydrothermal method. Such heteronanostructures exhibit high efficiency and excellent stability toward hydrogen production. The introduction of Au nanoparticles on to CdS nanorods not only made a Schottky junction with strong plasmonic absorption enhancement but also directed the growth of few layered MoS2 nanosheets as a hierarchical protective shell around the CdS nanorods. These CdS–Au/MoS2 hybrid structures possess a large number of edge sites in the MoS2 layers which are active sites for hydrogen evolution reaction. As a result, the CdS–Au/MoS2 CSHNSs exhibit outstanding hydrogen evolution performance which is 7 times that of pure CdS nanorods. Also these CdS–Au/MoS2 CSHNSs showed greater stability after a long-time test (16 h), and 90% of catalytic activity still remained. The enhanced hydrogen evolution activity of CdS–Au/MoS2 CSHNSs was attributed to the improved visible light absorption and the formation of heterojunctions between CdS, Au, and MoS2 components, which increases the charge separation efficiency and thereby suppresses the electron–hole recombination.