期刊
CHINESE CHEMICAL LETTERS
卷 33, 期 5, 页码 2579-2584出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.08.118
关键词
g-C3N4; Charge separation; Coplanar heterojunction; Enhanced pi-pi conjugation; Photocatalysis
This study achieves efficient photogenerated carrier separation by adjusting the electronic structure of graphitic carbon nitride (g-C3N4) photocatalyst through pi-pi conjugation. A coplanar heterojunction is created by doping crystalline g-C3N4 with a conjugated double bond ring molecule, resulting in the retention of the g-C3N4 network structure and enhanced separation and transfer of photogenerated carriers. The new g-C3N4 photocatalyst demonstrates high hydrogen production efficiency under visible light irradiation.
Adjusting the electronic structure of graphitic carbon nitride (g-C3N4) photocatalyst through pi-pi conjugation is an effective method to achieve efficient photogenerated carrier separation. One key challenge of pi-pi conjugation control is to tune the degree of such conjugation without destroying the g-C3N4 structure. Herein we report a conceptual design that achieves a coplanar heterojunction by enhancing the pi-pi conjugation via the doping of crystalline g-C3N4 using a conjugated double bond ring molecule, 1,3,5-benzenetriol, during calcination process. The selection of the dopant enables the facile creation of a unique coplanar heterojunction which not only retains the pristine network structure of g-C3N4, but remarkably promotes separation and transfer of photogenerated carriers through the enhanced pi-conjugated endogenous electric field. As a result, the new g-C3N4 photocatalyst efficiently photocatalytically produces hydrogen from water under visible light irradiation with a high H-2 production rate up to 94.94 mu mol/h, and a notable external quantum efficiency of 16.4% at 420 nm. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
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