期刊
NATURE ENERGY
卷 6, 期 4, 页码 388-397出版社
NATURE RESEARCH
DOI: 10.1038/s41560-021-00795-9
关键词
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资金
- Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China [51888103]
- National Natural Science Foundation of China [51961165103, 51672210]
- National Key Research and Development Program of China [2017YFE0193900, 2018YFB1502003]
- National Program for Support of Top-notch Young Professionals
- Youth Innovation Teams of Shaanxi Universities
- MoST [107-2112-M-032-004-MY3, 108-2218-E-032-003-MY3]
Researchers have successfully used doped carbon nitride-based Z-scheme heterostructures to split water and produce hydrogen, but coupling suitable H-2 and O-2 evolution components remains challenging.
Splitting water using suspensions of particulate carbon nitride-based photocatalysts may be a cheap way to produce hydrogen, but efficiencies have remained low. Now, Shen and colleagues use doped carbon nitride-based Z-scheme heterostructures to split water with a solar-to-hydrogen efficiency of 1.1% in the presence of metal-based co-catalysts. Photocatalytic overall water splitting can be achieved using Z-scheme systems that mimic natural photosynthesis by combining dissimilar semiconductors in series. However, coupling well-suited H-2- and O-2-evolving components remains challenging. Here, we fabricate a Z-scheme system for photocatalytic overall water splitting based on boron-doped, nitrogen-deficient carbon nitride two-dimensional (2D) nanosheets. We prepare ultrathin carbon nitride nanosheets with varying levels of boron dopants and nitrogen defects, which leads to nanosheets that can act as either H-2- or O-2-evolving photocatalysts. Using an electrostatic self-assembly strategy, the nanosheets are coupled to obtain a 2D/2D polymeric heterostructure. Owing to their ultrathin nanostructures, strong interfacial interaction and staggered band alignment, a Z-scheme route for efficient charge-carrier separation and transfer is realized. The obtained heterostructure achieves stoichiometric H-2 and O-2 evolution in the presence of Pt and Co(OH)(2) co-catalysts, and the solar-to-hydrogen efficiency reaches 1.16% under one-sun illumination.
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