Defect-Engineered Z-Scheme Heterojunction of Fe-MOFs/Bi<sub>2</sub>WO<sub>6</sub> for Solar-Driven CO<sub>2</sub> Conversion: Synergistic Surface Catalysis and Interfacial Charge Dynamics

Defect-Engineered Z-Scheme Heterojunction of Fe-MOFs/Bi<sub>2</sub>WO<sub>6</sub> for Solar-Driven CO<sub>2</sub> Conversion: Synergistic Surface Catalysis and Interfacial Charge Dynamics

The urgent need for sustainable CO<sub>2</sub> conversion technologies has driven the development of advanced photocatalysts that harness solar energy. This study employs a CTAB-assisted solvothermal method to fabricate a Z-scheme heterojunction Fe-MOFs/V<sub>O</sub>-Bi<su...

Full description

Saved in:
Bibliographic Details
Main Authors: Ting Liu, Yun Wu, Hao Wang, Jichang Lu, Yongming Luo
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Nanomaterials
Subjects:
photocatalytic CO<sub>2</sub> reduction
defect-engineered
heterojunctions
surface catalysis
charge transfer
Online Access:https://www.mdpi.com/2079-4991/15/8/618
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The urgent need for sustainable CO<sub>2</sub> conversion technologies has driven the development of advanced photocatalysts that harness solar energy. This study employs a CTAB-assisted solvothermal method to fabricate a Z-scheme heterojunction Fe-MOFs/V<sub>O</sub>-Bi<sub>2</sub>WO<sub>6</sub> (FM/V<sub>O</sub>-BWO) for photocatalytic CO<sub>2</sub> reduction. Positron annihilation lifetime spectroscopy (PALS) was employed to confirm the existence of oxygen vacancies, while spherical aberration-corrected transmission electron microscope (STEM) characterization verified the successful construction of heterointerfaces. X-ray absorption fine structure (XAFS) spectra confirmed that the defect configuration and heterostructure changed the surface chemical valence state. The optimized 1.0FM/V<sub>O</sub>-BWO composite demonstrated exceptional photocatalytic performance, achieving CO and CH<sub>4</sub> yields of 60.48 and 4.3 μmol/g, respectively, under visible-light 11.8- and 1.5-fold enhancements over pristine Bi<sub>2</sub>WO<sub>6</sub>. The enhanced performance is attributed to oxygen vacancy-induced active sites facilitating CO₂ adsorption/activation. In situ molecular spectroscopy confirmed the formation of critical CO<sub>2</sub>-derived intermediates (COOH* and CHO*) through surface interactions involving four-coordinated and two-coordinated hydrogen-bonded water molecules. Furthermore, the accelerated interfacial charge transfer efficiency mediated by the Z-scheme heterojunction has been conclusively demonstrated. This work establishes a paradigm for defect-mediated heterojunction design, offering a sustainable route for solar fuel production.
ISSN:2079-4991

Similar Items