期刊
ADVANCED SCIENCE
卷 9, 期 2, 页码 -出版社
WILEY
DOI: 10.1002/advs.202102530
关键词
CdSe quantum dots; expending visible-light response; one-photon Z-scheme; overall-water splitting; surface modifications; WO3
资金
- National Natural Science Foundation of China [11774044, 52072059]
- Chinese Government 1000-Young Talent Program
- Specialized Research Fund for the Doctoral Program of Higher Education [20133514110003]
- China Postdoctoral Science Foundation [2017M622404, 2018M640906+]
The construction of a one-photon Z-scheme system successfully stimulated two photocatalysts simultaneously, leading to a visible-light driven overall-water-splitting with enhanced performance. The utilization of density-functional theory helped understand the origin of this performance enhancement, providing a feasible strategy for practical applications of efficient one-photon Z-scheme.
Artificial Z-scheme, a tandem structure with two-step excitation process, has gained significant attention in energy production and environmental remediation. By effectively connecting and matching the band-gaps of two different photosystems, it is significant to utilize more photons for excellent photoactivity. Herein, a novel one-photon (same energy-two-photon) Z-scheme system is constructed between rGO modified boron-nitrogen co-doped-WO3, and coupled CdSe quantum dots-(QDs). The coctalyst-0.5%RhxCr2O3(0.5RCr) modified amount-optimized sample 6%CdSe/1%rGO3%BN-WO3 revealed an unprecedented visible-light driven overall-water-splitting to produce approximate to 51 mu mol h(-1) g(-1) H-2 and 25.5 mu mol h(-1) g(-1) O-2, and it remained unchanged for 5 runs in 30 h. This superior performance is ascribed to the one-photon Z-scheme, which simultaneously stimulates a two photocatalysts system, and enhanced charge separation as revealed by various spectroscopy techniques. The density-functional theory is further utilized to understand the origin of this performance enhancement. This work provides a feasible strategy for constructing an efficient one-photon Z-scheme for practical applications.
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