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- Title
Enhanced visible-light-driven heterogeneous photocatalytic COc methanation using a Cu<sub>2</sub> O@Cu-MOF-74 thin film.
- Authors
Hao Wu; Utomo, Wahyu Prasetyo; Yuanmeng Tian; Chun Hong Mak; Hoi Ying Chung; Hsien-Yi Hsu; Jin Shang; Yun Hau Ng
- 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.
- Subjects
CUPROUS oxide; PHOTOCATALYSTS; METAL-organic frameworks; METALLIC oxides; PHOTOCURRENTS
- Publication
ChemPhysMater, 2023, Vol 2, Issue 2, p126
- ISSN
2097-0323
- Publication type
Article
- DOI
10.1016/j.chphma.2022.05.003