Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 50, Pages 25436-25447Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.05.066
Keywords
G-C3N4; Isotype heterojunction; 1D/2D; Photocatalytic H-2 evolution; Visible light
Categories
Funding
- National Natural Science Foundation of China [U1703351, 52073179, 51663021]
- Bingtuan Excellent Young Scholars [CZ027205]
- Bingtuan Science & Technology Nova Program
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A simple and template-free strategy was developed to prepare 1D/2D g-C3N4 isotype heterojunction with high separation efficiency and strong visible light absorption. The isotype heterojunction significantly improved the photocatalytic H-2 evolution activity and stability.
It is still challenging to design effective g-C3N4 photocatalysts with high separation efficiency of photo-generated charges and strong visible light absorption. Herein, a simple, template-free and bottom-up strategy has been developed to prepare 1D/2D g-C3N4 isotype heterojunction composed of carbon-doped nanowires and ultra-thin nanosheets. The ethanediamine (EE) grafted on melamine ensures the growth of 1D g-C3N4 nanowires with high carbon doping, and the ultra-thin g-C3N4 nanosheets were produced through HCl-assisted hydrothermal strategy. The apparent grain boundary between 2D nanosheets and 1D carbon-doped nanowires manifested the formation of the isotype heterojunction. The built-in electric field provide strong driving force for photogenerated carriers separation. Meanwhile, the doping carbon in g-C3N4 nanowires promotes visible light absorption. As a result, the photocatalytic H-2 evolution activity of 1D/2D g-C3N4 isotype heterojunction is 8.2 time that of the pristine g-C3N4, and an excellent stability is also obtained. This work provides a promising strategy to construct isotype heterojunction with different morphologies for effective photocatalytic H-2 evolution. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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