CdS Nanorods Coupled with WS<sub>2</sub> Nanosheets\nfor Enhanced Photocatalytic Hydrogen Evolution Activity
Jie He (132999)Lang Chen (74845)Zi-Qi Yi (2888183)Chak-Tong Au (1449295)Shuang-Feng Yin (1478986)
Abstract
WS<sub>2</sub> nanosheets–CdS nanorods with heterojunctions\nwere prepared by an ultrasonic/exfoliation method using dimethylformamide\nas the dispersing agent. CdS nanorods were coupled with small WS<sub>2</sub> nanosheets as a result of exfoliation. An excellent hydrogen\nproduction rate of 1222 μmol h<sup>–1</sup> (20 mg of\ncatalyst) was achieved over the WS<sub>2</sub>–CdS composite\nwith a WS<sub>2</sub>-to-CdS mass ratio of 1.6:1 under visible-light\nirradiation (λ ≥ 400 nm). The efficient evolution of\nhydrogen is attributed to promotion of the separation of photogenerated\ncharge carriers due to the presence of heterojunctions created on\nthe surface.
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