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- Title
Insights into photocatalytic mechanism over a novel Cu<sub>2</sub>WS<sub>4</sub>/MoS<sub>2</sub> S-scheme heterojunction.
- Authors
Zhao, Wei; Cao, Ji-Hui; Liao, Jun-Jie; Liu, Yun; Zeng, Xiao-Jun; Shen, Jun-Yu; Hong, Xue-Kun; Guo, Yang; Zeng, He-Hua; Liu, Ya-Zi
- Abstract
A novel efficient Cu2WS4/MoS2 step-scheme (S-scheme) heterojunction photocatalyst was constructed for the first time and applied in the removal of environmental pollutants. Among the as-prepared photocatalysts, the Cu2WS4/MoS2-8% heterojunction photocatalyst demonstrates the optimal photocatalytic performance, with the catalytic oxidation efficiency of tetracycline (TC) and the catalytic reduction efficiency of Cr6+ reaching 93.3% and 82.1%, respectively. The excellent catalytic properties of Cu2WS4/MoS2 heterojunction photocatalysts are attributed to the effective separation pathways of charges and the presence of S-scheme heterojunctions, together with stronger redox capabilities. It is speculated that the photogenerated carrier migration path of the Cu2WS4/MoS2 catalyst follows the typical S-scheme photocatalytic mechanism, which is verified by the in-depth experimental study and simulated calculations including the electron paramagnetic resonance (EPR) analysis, free radical quenching experiments, charge density distribution, and simulated built-in electric field formation at the interface, which acts as driving force to promote the separation of photoinduced electrons and holes. Finally, the photocatalytic mechanism of S-scheme photogenerated carrier migration for the Cu2WS4/MoS2 catalyst is revealed based on the systematic experimental techniques and simulated calculations, accounting for its superior photocatalytic oxidation and reduction activities. This study provides inspiring implications to develop high-efficient S-scheme photocatalytic systems for versatile applications in solar-energy conversion.
- Publication
Rare Metals, 2024, Vol 43, Issue 7, p3118
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-024-02653-5