期刊
NANOSCALE
卷 10, 期 19, 页码 9292-9303出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr00017d
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资金
- National Natural Science Fund Committee-Baosteel Group Corporation Steel Joint Research Fund, China [U1460105]
- Opening Project of State Key Laboratory of Crystal Materials, Shandong University, China [KF1710]
- Opening Project of State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, China [201715]
- State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, China [EIPE18311]
- Fundamental Research Funds for the Central Universities, China
Coupling two semiconductors together to construct a Z-scheme type photocatalytic system is an efficient strategy to solve the serious recombination challenge of photogenerated electrons and holes. In this work, we develop a novel composite photocatalyst by sandwiching metallic 1T-phase MoS2 nanosheets between MoO3 and g-C3N4 (MoO3/1T-MoS2/g-C3N4) for the first time. The metallic 1T-phase MoS2 acts as an efficient electron mediator between MoO3 and g-C3N4 to construct an all-solid-state Z-scheme photocatalytic system, resulting in a highly-efficient spatial charge separation and transfer process. Benefiting from this, the newly developed MoO3/1T-MoS2/g-C3N4 exhibits a drastically enhanced photocatalytic H-2 evolution rate of 513.0 mu mol h(-1) g(-1) under visible light irradiation (>420 nm), which is nearly 12 times higher than that of the pure g-C3N4 (39.5 mu mol h(-1) g(-1)), and 3.5 times higher than that of MoO3/g-C3N4 (145.7 mu mol h(-1) g(-1)). More importantly, the originally unstable 1T-phase MoS2 becomes very stable in MoO3/1T-MoS2/g-C3N4 because of the sandwich structure where 1T-phase MoS2 is protected by MoO3 and g-C3N4, which endows the photocatalyst with excellent photostability. It is believed that this study will provide new insights into the design of efficient and stable Z-scheme heterostructures for photocatalytic applications.
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