Self-assembled lead-free double perovskite-MXene heterostructure with efficient charge separation for photocatalytic CO2 reduction

Zhipeng Zhang, Bingzhe Wang, Hai Bing Zhao, Jin Feng Liao, Zi Chun Zhou, Tanghao Liu, Bingchen He, Qi Wei, Shi Chen, Hong Yan Chen, Dai Bin Kuang*, Ying Li*, Guichuan Xing*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Lead-free double perovskites with superior stability have been considered as promising non-toxic substitutes to their lead-contained counterparts in photocatalysis. However, the severe charge recombination greatly restricts their potential as high-performance photocatalysts. Herein, for the first time, we present a self-assembled heterostructure of lead-free double perovskite Cs2AgBiBr6 nanocrystals (NCs) on the surface of MXene nanosheets via mutual electrostatic attraction. The presence of MXene nanosheets effectively promotes the formation of free charge carriers in Cs2AgBiBr6 NCs via reducing the exciton binding energy. Additionally, the ultrafast photogenerated electron transfer from Cs2AgBiBr6 to MXene with a timescale of 1.1 ps largely prolongs the charge carrier lifetime by two times. As a result of the efficient charge separation and electron extraction, the Cs2AgBiBr6/MXene heterostructures achieve a high photoelectron consumption yield of 50.6 µmol g−1 h−1 for photocatalytic CO2 reduction, which surpasses most previously reported lead-free perovskite-based catalysts.

Original languageEnglish
Article number121358
JournalApplied Catalysis B: Environmental
Volume312
DOIs
Publication statusPublished - 5 Sep 2022
Externally publishedYes

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Charge transfer
  • Double perovskite nanocrystals
  • Heterostructures
  • MXene nanosheets
  • Photocatalysis

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