Interfacial Electronic Properties and Photocatalytic CO2 Reduction of a Z-Scheme SnS/(CH3NH3)2AgBiI6 Double Perovskite Heterostructure

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Peiying Li
  • Yanming Lin
  • Mintong Ma
  • Minjie Zhang
  • Jiayi Li
  • Zhengkun Wang
  • Velusamy Maheskumar
  • Zhen-Yi Jiang

Detail(s)

Original languageEnglish
Pages (from-to)1942-1952
Journal / PublicationACS Applied Energy Materials
Volume5
Issue number2
Online published10 Feb 2022
Publication statusPublished - 28 Feb 2022

Abstract

The conversion of CO2 into energy fuel is an effective strategy to address energy shortages and environmental problems. To enhance the photocatalytic activity of CO2 reduction, the lead-free halide double perovskite (CH3NH3)2AgBiI6 (010) surface is combined with a SnS monolayer to construct a stable SnS/(CH3NH3)2AgBiI6 photocatalyst. The bandgap of SnS/(CH3NH3)2AgBiI6 is narrow (1.566 eV) compared with the (CH3NH3)2AgBiI6 (010) surface, which enhances the absorption of visible light and leads to the redshift of the absorption edge. The interface interaction between the (CH3NH3)2AgBiI6 (010) surface and the SnS monolayer causes electron flow from the SnS monolayer to the (CH3NH3)2AgBiI6 (010) surface. SnS/(CH3NH3)(2)AgBiI6 has a good Z-scheme band alignment, which facilitates the separation of electron-hole pairs. The electrons accumulate at the CB of the SnS monolayer and participate in the CO2 reduction reaction. In comparison with the (CH3NH3)2AgBiI6 (010) surface, SnS/ (CH3NH3)2AgBiI6 changes the rate-determination step and reduces the Gibbs free energy from 2.17 to 1.72 eV. The results indicate that SnS/(CH3NH3)2AgBiI6  improves the photocatalytic activity of CO2 reduction.

Research Area(s)

  • CO2 reduction, density functional theory, double perovskite, heterostructure, photocatalyst

Citation Format(s)

Interfacial Electronic Properties and Photocatalytic CO2 Reduction of a Z-Scheme SnS/(CH3NH3)2AgBiI6 Double Perovskite Heterostructure. / Li, Peiying; Lin, Yanming; Ma, Mintong et al.
In: ACS Applied Energy Materials, Vol. 5, No. 2, 28.02.2022, p. 1942-1952.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review