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A Strategy of Enhancing the Photoactivity of g-C3N4via Doping of Nonmetal Elements: A First-Principles Study

Ma, Xinguo, Lv, Yanhui, Xu, Jing, Liu, Yanfang, Zhang, Ruiqin, Zhu, Yongfa·2012·The Journal of Physical Chemistry C

Abstract

An effective structural doping approach has been described to modify the photoelectrochemical properties of g-C 3 N 4 by doping with nonmetal (sulfur or phosphorus) impurities. Here, the substitutional and interstitial doped models of g-C 3 N 4 systems were constructed with different doped sites, and then their dopant formation energies and electronic properties were performed to study the stability and visible-light photoactivity using first-principles density functional theory, respectively. Our results have identified that an S atom preferentially substitutes for the edge N atom of g-C 3 N 4; however, a P atom preferentially situates the interstitial sites of in-planar of g-C 3 N 4 . Furthermore, it is demonstrated that the doping with nonmetal impurities reduces the energy gap to enhance the visible-light absorption of g-C 3 N 4 . The increased dispersion of the contour distribution of the HOMO and LUMO brought by doping facilitates the enhancement of the carrier mobility, while the noncoplanar HOMO and LUMO favor the separation of photogenerated electron–hole pairs. Especially, P interstitial doping shows a prominent potential due to the appearance of a new channel for carrier migration. It should be pointed out that the proper doping form should be controlled, so that reasonable photoelectrochemical properties can be achieved.

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Metadata

Authors
Ma, X., Lv, Y., Xu, J., Liu, Y., Zhang, R., & Zhu, Y.
Venue
The Journal of Physical Chemistry C
Published
2012-10-25
Volume
116
Issue
44
Pages
23485-23493
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2014002196
Cited by
713
References
2
FWCI
6.80
Type
journal article
Language
en
Open access
closed

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