期刊
JOURNAL OF ADVANCED CERAMICS
卷 11, 期 9, 页码 1431-1444出版社
SPRINGER
DOI: 10.1007/s40145-022-0621-3
关键词
Mo2C MXene; MoO2; CdS; photocatalysis; H-2 production
资金
- National Natural Science Foundation of China [51772077]
- Program for Innovative Research Team (in Science and Technology) in the University of Henan Province [19IRTSTHN027]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF200101]
- Henan Key Laboratory of Materials on Deep-Earth Engineering [MDE2019-02]
Photocatalytic technologies are considered as promising strategies to solve energy problems. In this paper, a novel CdS/MoO2@Mo2C-MXene photocatalyst was constructed using a two-step hydrothermal method. The composite exhibited an ultrahigh visible-light photocatalytic H-2 production activity and improved energy band structure, providing a new pathway for preparing low-cost photocatalysts.
Nowadays, photocatalytic technologies are regarded as promising strategies to solve energy problems, and various photocatalysts have been synthesized and explored. In this paper, a novel CdS/MoO2@Mo2C-MXene photocatalyst for H-2 production was constructed by a two-step hydrothermal method, where MoO2@Mo2C-MXene acted as a binary co-catalyst. In the first hydrothermal step, MoO2 crystals with an egged shape grew on the surface of two-dimensional (2D) Mo2C MXene via an oxidation process in HCl aqueous solution. In the second hydrothermal step, CdS nanorods were uniformly assembled on the surface of MoO2@Mo2C-MXene in ethylenediamine with an inorganic cadmium source and organic sulfur source. The CdS/MoO2@Mo2C-MXene composite with MoO2@Mo2C-MXene of 5 wt% exhibits an ultrahigh visible-light photocatalytic H-2 production activity of 22,672 mu mol/(g.h), which is similar to 21% higher than that of CdS/Mo2C-MXene. In the CdS/MoO2@Mo2C-MXene composite, the MoO2 with metallic nature separates CdS and Mo2C MXene, which acts as an electron-transport bridge between CdS and Mo2C MXene to accelerate the photoinduced electron transferring. Moreover, the energy band structure of CdS was changed by MoO2@Mo2C-MXene to suppress the recombination of photogenerated carriers. This novel compound delivers upgraded photocatalytic H-2 evolution performance and a new pathway of preparing the low-cost photocatalyst to solve energy problems in the future.
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