Photocatalytic water splitting of (F, Ti) codoped heptazine/triazine based g-C3N4 heterostructure : A hybrid DFT study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Yali Zhao
  • Yanming Lin
  • Guanshi Wang
  • Zhenyi Jiang
  • Chaoyuan Zhu

Detail(s)

Original languageEnglish
Pages (from-to)809-819
Journal / PublicationApplied Surface Science
Volume463
Early online date2 Aug 2018
StatePublished - 1 Jan 2019

Abstract

Graphitic carbon nitride (g-C3N4) has been widely investigated as a metal-free photocatalyst for water splitting. However, the rapid recombination of photoexcited carriers and narrow visible-light response region substantially limit its performance. In this work, we have systematically studied the geometrical, electronic, optical, charge transfer and photocatalytic mechanism of (F, Ti) codoped heptazine/triazine based g-C3N4 heterostructure using hybrid density functional approach. The interface interaction between heptazine and triazine g-C3N4 shows heptazine and triazine g-C3N4 form a Van Der Waals heterostructure. The bandgap of (F, Ti) codoped heptazine/triazine based g-C3N4 heterostructure is narrow (2.39 eV), which enhances the absorption of visible light and leads to an obvious redshift of absorption edge. A type-II heterostructure is formed at the interface of (F, Ti) codoped heptazine/triazine based g-C3N4 heterostructure, and leads to high photocatalytic activity. Furthermore, Bader charge and charge density difference indicate that the internal electric field promotes the separation of electron-hole pairs in the heptazine/triazine g-C3N4 interface and inhibits carrier recombination. Meanwhile, electrons in the conduction band of triazine g-C3N4 and holes in the valence band of (F, Ti) codoped heptazine g-C3N4 have enough redox ability. This work is helpful in understanding the mechanism of photocatalytic water splitting and relevant experimental observations.

Research Area(s)

  • Bader charge, Electronic structure, Heterostructure, Hybrid DFT, Photocatalytic water splitting

Citation Format(s)

Photocatalytic water splitting of (F, Ti) codoped heptazine/triazine based g-C3N4 heterostructure : A hybrid DFT study. / Zhao, Yali; Lin, Yanming; Wang, Guanshi; Jiang, Zhenyi; Zhang, Ruiqin; Zhu, Chaoyuan.

In: Applied Surface Science, Vol. 463, 01.01.2019, p. 809-819.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review