期刊
CHEMICAL ENGINEERING JOURNAL
卷 395, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125150
关键词
CN/BCN; 2D/2D VdW heterojunction; Photocatalytic H-2 production; Z-scheme mechanism
资金
- NSFC-Shanxi Coal Based Low Carbon Joint Fund [U1810117]
- National Natural Science Foundation of China [21606114]
- Natural Science Foundation of Jiangsu Province [BK20190867]
- Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University) [2019009]
- Innovation and Entrepreneurship Training Program for College Students [201913986006Y]
Metal-free material is a kind of promising ideal candidate in application of photocatalytic hydrogen (H-2) production for everlasting direct solar-to-fuel conversion, but a longstanding challenge still is how to achieve the continuously high-efficiency and stable H-2 production performance. Herein, metal-free 2D/2D carbon nitride/C-doped BN (CN/BCN) Van der Waals (VdW) heterojunctions are fabricated, and the optimal photocatalytic H-2 production rate over them reaches up to 3357.1 mu mol h(-1) g(-1) that far exceeds that of single CN (1298.8 mu mol h(-1) g(-1)) under the visible light. Meanwhile, the high apparent quantum efficiency (AQE) of 16.3% at 420 nm is achieved surprisingly. Moreover, the metal-free 2D/2D CN/BCN VdW heterojunction exhibits the superior stability because H-2 production rate has barely reduction when enduring 15 cycle runs with total 60 h. The boosted H-2 production performance arises from the formation of Z-Scheme mechanism that dramatically accelerates interfacial transfer and separation of charge carriers. This work furnishes a demonstration model for the tailor-made design and fabrication of other challenging metal-free 2D/2D VdW heterojunctions applied to catalysis, electronics, optoelectronics, etc.
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