期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 270, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118867
关键词
Phosphorus doping; Expending visible-light response; CdSe quantum dots; g-C3N4; Solar fuel
资金
- National Natural Science Foundation of China [11774044, 21850410460]
- Chinese Government 1000-Young Talent Program
- Specialized Research Fund for the Doctoral Program of Higher Education [20133514110003]
- China Postdoctoral Science Foundation [2017M622404, 2018M640906+]
- Australian Research Council [FT160100207, 160100205]
Solar energy harvesting and conversion into useful chemical energy with the aid of semiconductor photocatalysts is a promising technique to solve both energy and environmental issues. This work reports a successful synthesis of CdSe quantum dots (QDs) modified phosphorus doped g-C3N4 (P-CN) for advanced photocatalytic applications. Phosphorus doping and structural coupling with CdSe QDs are shown to significantly extend visible-light response of g-C3N4 up to 700 nm. The optimized sample 4CdSe/P-CN demonstrates enhanced visible-light driven overall water splitting activities for H-2 and O-2 evolution i.e. 113 and 55.5 mu mol.h(-1).g(-1), respectively, as well as very high photocatalytic CO2 to CH4 conversion efficiency (47 mu mol.h(-1). g(-1)). It also exhibit higher activity (78 %) for 2,4-dichlorophenol degradation as compared to pristine CN-sample. Combined photoluminescence, transient/single wavelength photocurrent, photoelectrochemical, and coumarin fluorescence spectroscopy demonstrate that 4CdSe/P-CN nanocomposite exhibit enhanced charge separation efficiency which is responsible for improved visible light catalytic activities. Our work thus provide a new strategy to design low-cost and sustainable photocatalysis with wide visible-light activity for practical overall water splitting and CO2 reduction applications.
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