Enhanced visible-light-driven heterogeneous photocatalytic CO2 methanation using a Cu2O@Cu-MOF-74 thin film

Hao Wu, Wahyu Prasetyo Utomo, Yuanmeng Tian, Chun Hong Mak, Hoi Ying Chung, Hsien Yi Hsu, Jin Shang, Yun Hau Ng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Cuprous oxide is a potential photocatalyst for the reduction of CO2. However, its high rate of charge recombination and low ability to adsorb CO2 limit its activity, particularly when gaseous CO2 was used. Herein, a Cu-based metal-organic framework (Cu-MOF-74) with high CO2 adsorption is coated onto Cu2O nanowires by a topotactic transformation method. The optimized Cu2O@Cu-MOF-74 composite thin film showed a CH4 evolution rate 4.5 times higher than that of bare Cu2O under visible light illumination (>420 nm), with water vapor as the electron donor. Analysis results of electrochemical impedance spectroscopy, transient photocurrent measurements, and fluorescence spectroscopy collectively suggest that the decoration of Cu2O with Cu-MOF-74 facilitates electron extraction from excited Cu2O, thereby inducing long-lived photocharges for the reduction of CO2. This study provides insights into the modification of transition metal oxides for application in photocatalysis by coating the surface with metal-organic frameworks.

Original languageEnglish
Pages (from-to)126-133
Number of pages8
JournalChemPhysMater
Volume2
Issue number2
DOIs
Publication statusPublished - Apr 2023
Externally publishedYes

Keywords

  • CO conversion
  • Charge transport
  • Metal oxide
  • Metal-organic framework
  • Photocatalysis

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