期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 494-502出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.159
关键词
Photocatalysis; Water splitting; Carbon nitride; Extended visible-light-absorption
资金
- Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foun-dation of China [51888103]
- National Natural Science Foundation of China [51906197]
- Natural Science Foundation of Shaanxi Province [2020JQ-040]
- Natural Science Basic Research Program of Shaanxi Province [2019JCW-10]
- China Postdoctoral Science Foundation [2020M673386, 2020T130503]
- China Fun-damental Research Funds for the Central Universities
In this study, a phenyl-grafted carbon nitride photocatalyst was synthesized, which exhibited extended visible-light absorption and a higher photocatalytic H2-evolution rate compared to conventional catalysts.
Developing and employing photocatalysts with extended visible-light-absorption has emerged as a fundamental issue for the enhanced capability of photocatalytic H-2 evolution from water splitting. Herein, a wide-spectrum light-responsive phenyl-grafted carbon nitride photocatalyst was synthesized. It was found that benzonquanmine-derived g-C3N4 (BCN) exhibits significantly extended light absorption (similar to 670 nm) compared with conventional melamine-derived g-C3N4 (MCN). Correspondingly, the photocatalytic H2-evolution rate of BCN (2846 lmol h(-1) g(-1)) is five times as that of MCN under visible-light irradiation. Particularly, an impressive H-2-evolution rate of 58 lmol h(-1) g(-1) could be achieved on BCN even under light irradiation beyond 620 nm. The outstanding photocatalytic H-2-evolution performance could be not only attributed to the enriched photons generated from the enhanced solar energy harvesting, but also to the distinctly inhibited rapid recombination of photogenerated electron-hole pairs resulting from the incorporation of phenyl groups. This work furnishes a new train of thought for the designing of carbon-nitride-based photocatalysts with enhanced capability of visible-light-utilization. (C) 2022 Elsevier Inc. All rights reserved.
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