Journal
ACS CATALYSIS
Volume 8, Issue 2, Pages 1532-1545Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b04228
Keywords
Cd0.8Zn0.2S/rGO; NiSx; quantum dot; nanosheet; hydrogen evolution
Categories
Funding
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JZ001]
- National Natural Science Foundation of China [21303130]
- State Key Laboratory of Heavy Oil Processing [SKLOP201602001]
- Fundamental Research Funds for the Central Universities [cxtd2017004]
- K. C. Wong Education Foundation, Hong Kong, People's Republic of China
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Minimizing the charge transfer barrier to realize fast spatial separation of photoexcited electron-hole pairs is of crucial importance for strongly enhancing the photocatalytic H-2 generation activity of photocatalysts. Herein, we propose an electron transfer strategy by reasonable design and fabrication of high-density NiSx quantum dots (QDs) as a highly efficient cocatalyst on the surface of Cd0.8Zn0.2S/rGO nanosheet composites. Under visible-light irradiation, the formation of a two-dimensional (2D) Cd0.8Zn0.2S/rGO nanohybrid system with 2 wt % NiSx loading gave a prominent apparent quantum efficiency (QE) of 20.88% (435 nm) and H-2 evolution rate of 7.84 mmol g(-1) H-1, which is 1.4 times higher than that of Pt/Cd0.8Zn0.2S/rGO. It is believe that the introduced rGO nanosheets and NiSx QDs obviously improved the interfacial conductivity and altered the spatial distribution of electrons in this nanoarchitecture. Thus, the synergistic effects of interfacial junctions result in a regulated electron transportation pathway along the basal planes and ultrafast transfer and spatial separation of photoexcited carriers, which are responsible for the enhanced photocatalytic performance. This work gives a facile and effective strategy to understand and realize rationally designed advanced photocatalysts for high-efficiency, stable, and cost-efficient solar hydrogen evolution applications.
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