Citation: Bingqing Wang, Yao Ding, Zirong Deng, Zhaohui Li. Rational design of ternary NiS/CQDs/ZnIn₂S₄ nanocomposites as efficient noble-metal-free photocatalyst for hydrogen evolution under visible light[J]. Chinese Journal of Catalysis, ;2019, 40(3): 335-342. doi: 10.1016/S1872-2067(18)63159-6 shu

Rational design of ternary NiS/CQDs/ZnIn₂S₄ nanocomposites as efficient noble-metal-free photocatalyst for hydrogen evolution under visible light

Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, Fujian, China

Received Date: 11 August 2018
Revised Date: 6 September 2018

Fund Project: This work was supported by the National Key Basic Research Program of China (973 Program, 2014CB239303), the National Natural Science Foundation of China (21872031, U1705251) and the Award Program for Minjiang Scholar Professorship.

The NiS/CQDs nanocomposite (CQDs represents carbon quantum dots), with a mass ratio of NiS/CQDs to be 1.19:1 based on the ICP result, was obtained via a facile hydrothermal method from a mixture of CQDs, Ni(OAc)₂ and Na₂S. The self-assembly of ZnIn₂S₄ microspheres on the surface of NiS/CQDs was realized under microwave conditions to obtain a ternary NiS/CQDs/ZnIn₂S₄ nanocomposite. The as-obtained NiS/CQDs/ZnIn₂S₄ nanocomposite was fully characterized, and its photocatalytic hydrogen evolution under visible light irradiation was investigated. The ternary NiS/CQDs/ZnIn₂S₄ nanocomposite showed superior photocatalytic activity for hydrogen evolution than ternary CQDs/NiS/ZnIn₂S₄, which was obtained by deposition of NiS in the preformed CQDs/ZnIn₂S₄. The superior photocatalytic performance of ternary NiS/CQDs/ZnIn₂S₄ is ascribed to the introduction of CQDs, which act as a bridge to promote the vectorial transfer of photo-generated electrons from ZnIn₂S₄ to NiS. This result suggests that the rational design and fabrication of ternary CQDs-based systems are important for the efficient photocatalytic hydrogen evolution. This study provides a strategy for developing highly efficient noble-metal-free photocatalysts for hydrogen evolution using CQDs as a bridge to promote the charge transfer in the nanocomposite.
- Photocatalysis,
- Hydrogen evolution,
- NiS,
- Carbon quantum dots,
- ZnIn₂S₄
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Rational design of ternary NiS/CQDs/ZnIn2S4 nanocomposites as efficient noble-metal-free photocatalyst for hydrogen evolution under visible light

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通讯作者: 陈斌, bchen63@163.com

Rational design of ternary NiS/CQDs/ZnIn₂S₄ nanocomposites as efficient noble-metal-free photocatalyst for hydrogen evolution under visible light