4.7 Article

Insight into the influence of donor-acceptor system on graphitic carbon nitride nanosheets for transport of photoinduced charge carriers and photocatalytic H2 generation

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 601, Issue -, Pages 326-337

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.145

Keywords

Graphitic carbon nitride nanosheets; Donor-acceptor system; Molecular dipole; Photoinduced charges transport; H-2 generation

Funding

  1. National Natural Science Foundation of China [21673060, 21871066, 21972034]
  2. State Key Lab of Urban Water Resource and Environment of Harbin Institute of Technology [HIT2019DX12]

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The rapid recombination of photogenerated charges in graphitic carbon nitride (CN) material limits the photocatalytic H-2 generation efficiency. Introducing a donor-acceptor (D-A) system can improve the transport of photoinduced charge carriers, with oxygen and/or phenyl doping in CN nanosheets showing promising results in photocatalytic H-2 evolution.
The rapid recombination of photogenerated charges is one of the main restriction for promoting the photocatalytic H-2 generation of graphitic carbon nitride (CN) material. Herein, donor-acceptor (D-A) system was introduced into CN nanosheets by oxygen and/or phenyl doping (DA-CN) strategy to facilitate the transport of photoinduced charge carriers and H-2 generation. Experimental and theoretical results revealed that the nanosheet structure of DA-CN shortened the photoexcited charges transport length to the surface, and the D-A system embedded in DA-CN provided the dipole-induced internal electric field for charges transport. As a consequence, compared with pristine CN, DA-CN samples performed the improved transport of photogenerated charges and photocatalytic H-2 evolution. Notably, DA-CN-OP (oxygen and phenyl co-doping) with the strongest dipole-induced internal electric field originated from D-A system displayed the highest photocatalytic H-2 evolution rate at 7.394 mmol g(-1)h(-1), which was 7.67 times as that of pristine CN (0.964 mmol g(-1)h(-1)). This work not only provides a simple strategy to construct highly efficient CN nanosheet photocatalyst with D-A system, but also promote the deep insight into the effect of molecular dipole originated from D-A system on the transport of photoinduced charge carriers and photocatalytic activity for CN material. (C) 2021 Elsevier Inc. All rights reserved.

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