期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 47, 页码 52603-52614出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14262
关键词
water splitting; facile strategy; defect; thickness; synergistically regulate
资金
- National Natural Science Foundation of China [21975245, 51972300, 61674141]
- Key Research Program of Frontier Science, CAS [QYZDB-SSW-SLH006]
- National Key Research and Development Program of China [2017YFA0206600, 2018YFE0204000]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB43000000]
- Youth Innovation Promotion Association, Chinese Academy of Sciences [2020114]
- Natural Science Foundation of Hebei Province [F2019402063]
Modulating and optimizing the diverse parameters of photocatalysts synergistically as well as exerting these advantages fully in photocatalytic reactions are crucial for the sufficient utilization of solar energy but still face various challenges. Herein, a novel and facile urea- and KOH-assisted thermal polymerization (UKATP) strategy is first developed for the preparation of defect-modified thin-layered and porous g-C3N4 (DTLP-CN), wherein the thickness of g-C3N4 was dramatically decreased, and cyano groups, nitrogen vacancies, and mesopores were simultaneously introduced into g-C3N4. Importantly, the roles of thickness, pores, and defects can be targetedly modulated and optimized by changing the mass ratio of urea, KOH, and melamine. This can remarkably increase the specific area, improve the light-harvesting capability, and enhance separation efficiency of photoexcited charge carriers, strengthening the mass transfer in g-C3N4. Consequently, the photocatalytic hydrogen evolution efficiency of the DTLP-CN (1.557 mmol h(-1) g(-1), lambda > 420 nm) was significantly improved more than 48.5 times with the highest average apparent quantum yield (AQY) of 18.5% and reached as high as 0.82% at 500 nm. This work provides an effective strategy for synergistically regulating the properties of g-C3N4, and opens a new horizon to design g-C3N4-based catalysts for highly efficient solar-energy conversion.
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