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Incorporating nitrogen defects into novel few-layer carbon nitride nanosheets for enhanced photocatalytic H2 production.
- Source :
-
Applied Surface Science . Nov2020, Vol. 529, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Solvothermal processed melem is crucial for tailoring carbon nitride structure. • Nitrogen defects and few-layer nanosheet are simultaneously formed in carbon nitride. • DCNS-120 has optimal properties by combining nitrogen defect and nanosheet structure. • DCNS-120 shows 33-folds increase compared to BCN for photocatalytic H 2 production. Carbon nitride nanosheets have shown a great promise for photocatalytic water splitting among numerous photocatalysts due to the versatile advantages. The crucial issues of the weak visible-light absorption and the separation of photo-generated carrier remain a matter of serious concern. Herein, we report a facile calcination-solvothermal-calcination method to prepare nitrogen-deficient carbon nitride nanosheets (DCNS) for the first time, which leads to the simultaneous introduction of nitrogen defects and formation of a fragmented few-layer nanosheet structure. The fragmented few-layer nanosheet structure is known to possess a high specific surface area and abundant interfacial reaction sites, contributing to the rapid consumption of photo-generated carrier. The nitrogen defects are responsible for further boosting the photocatalytic performance by regulating the band structure and optical properties as well as improving the separation efficiency of photo-generated carrier. The optimized DCNS-120 delivers a superior H 2 production rate of 5375 μmol·g−1·h−1, considerably higher than that of bulk carbon nitride (164 μmol·g−1·h−1). We anticipate that this work may pave a new pathway to engineering carbon nitride with a matched structure to achieve the desired efficient photocatalytic H 2 production under visible-light irradiation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NITRIDES
*NITROGEN
*INTERFACIAL reactions
*CARBON
*OPTICAL properties
*SURFACE area
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 529
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 147364023
- Full Text :
- https://doi.org/10.1016/j.apsusc.2020.147104