期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 284, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119742
关键词
Graphitic carbon nitride; Surface modification; Sulfur-doping; Two-dimensional materials; Visible water splitting
资金
- China Postdoctoral Science Foundation [2019M663802]
- National Natural Science Foundation of China [21973075, 21306018]
- Shannxi Key Research Grant [2020GY-244]
- EPSRC [2298390] Funding Source: UKRI
By controlling the precursor dosage and introducing sulfur doping into the polymer, sulfur-doped holey g-C3N4 nanosheets with excellent visible-light driven photocatalytic hydrogen production activity were prepared. The optimized catalyst exhibits efficient hydrogen evolution activity under visible light, thanks to the effects of enlarged surface area, negatively-shifted conduction band, and narrowed bandgap.
Surface engineering is an efficient way to enhance photoabsorption, promote charge separation and boost photocatalysis. Herein, sulfur-doped holey g-C3N4 nanosheets have been prepared through a universal self-templating approach with thiocyanuric acid as the single-precursor. By subtly controlling the feeding amount of precursor, the synthesized sulfur-doped holey g-C3N4 nanosheets exhibit excellent visible-light driven photocatalytic hydrogen production activity. The optimized catalyst presents a hydrogen evolution rate of 6225.4 umol g(-l) h(-1), with an apparent quantum yield of 10 % at 420 nm. Comprehensive characterizations and theoretical calculations suggest that the enhanced photocatalysis is attributed to the synergy of the enlarged surface area, the negatively-shifted conduction band, and the narrowed bandgap due to sulfur-doping and ultra-thin twodimensional topology. This work highlights the importance of controlling the precursor dosage and inducing sulfur doping into the polymer, providing a promising and reliable strategy to simultaneously regulate the nanostructural and electronic structure of g-C3N4 for highly efficient photocatalysis.
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