期刊
NANO ENERGY
卷 99, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107432
关键词
Carbon nanofibers; Crystalline g-C3N4; Electrostatic self-assembly; Microwave hydrothermal; Photocatalytic H-2 evolution
类别
资金
- National Natural Science Foundation of China [22075072, 22178224]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110873]
- Shenzhen Funda-mental Research Program [JCYJ20190813113408912]
- University En-gineering Research Center of Crystal Growth and Applications of Guangdong Province [2020GCZX005]
- 2020 National Undergradu-ate Training Programs for Innovation and Entrepreneurship
The 1D carbon nanofibers/crystalline g-C(3)N(4) heterojunction photocatalyst (CNF/CCN) obtained through electrostatic self-assembly combined with microwave heating strategy shows an enhanced photocatalytic H-2 evolution rate. The improved performance is attributed to the enhanced crystallinity of CN, promoted visible light utilization, large specific surface area, and efficient charge transfer across the interface between CNF and CCN.
g-C3N4 (CN) has been widely explored as a visible light photocatalyst. Nevertheless, the low structural ordering of CN suffers from high-density defects that resulting in poor charge separation efficiency. Therefore, increasing the crystallinity of CN is considered to be an efficient approach to enhance its photocatalytic activity. However, crystalline g-C3N4 (CCN) synthesized via ionothermal method exhibits one-dimensional (1D) nanomd structure and is prone to agglomerate due to its high surface energy, giving rise to unsatisfactory performance improvement. Herein, the 1D carbon nanofibers/crystalline g-C(3)N(4 )heterojunction photocatalyst (CNF/CCN) is obtained through electrostatic self-assembly combined with microwave heating strategy. The CNF/CCN sample shows an enhanced photocatalytic H-2 evolution rate (HER) of 6398 mu mol g(-1) h(-1), which is up to 16.0 and 2.6 times of CN and CCN, respectively. The enhanced HER performance of CNF/CCN is attributed to the improved crystallinity of CN, promoted visible light utilization, large specific surface area and efficient charge transfer across the interface between CNF and CCN. This work conveys a simple and general method for crystallinity and activity enhancement for a wide range application of CN.
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