Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 14, Pages 3992-3996Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201700286
Keywords
carbon nitride; hydrogen; nanosheets; photocatalysis; steam reforming
Categories
Funding
- National Basic Research Program of China [2013CB632405]
- National Natural Science Foundation of China [21425309, 2161101090]
- National Postdoctoral Program for Innovative Talents [BX201600031]
- 111 Project
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The delamination of layered crystals that produces single or few-layered nanosheets while enabling exotic physical and chemical properties, particularly for semiconductor functions in optoelectronic applications, remains a challenge. Here, we report a facile and green approach to prepare few-layered polymeric carbon nitride (PCN) semiconductors by a one-step carbon/nitrogen steam reforming reaction. Bulky PCN, obtained from typical precursors including urea, melamine, dicyandiamide, and thiourea, are exfoliated into few-layered nanosheets, while engineering its surface carbon vacancies. The unique sheet structures with strengthened surface properties endow PCNs with more active sites, and an increased charge separation efficiency with a prolonged charge lifetime, drastically promoting their photoredox performance. After an assay of a H-2 evolution reaction, an apparent quantum yield of 11.3% at 405 nm was recorded for the PCN nanosheets, which is much higher than those of PCN nanosheets. This delamination method is expandable to other carbon-based 2D materials for advanced applications.
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