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Designing multi-layered MOF-on-MOF-transformed core double-shell FeSx@ZnS@CoSx heterojunction for enhanced CO2 photoreduction with water vapor.
- Source :
-
Chemical Engineering Journal . Oct2023, Vol. 474, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- [Display omitted] • A ternary MOF-on-MOF strategy was introduced to synthesize the core double-shell FeS x @ZnS@CoS x catalyst. • FeS x @ZnS@CoS x exhibited the excellent catalytic activity for the CO 2 photoreduction. • FeS x @ZnS@CoS x structure with dual type II heterojunctions improved the separation of electron-hole pairs. • The superstructure of CoS x species provided abundant active sites and broadened light absorption capacity. The construction of core–shell structures derived from metal-organic framework (MOF) precursors is considered as a promising strategy for promoting photocatalytic CO 2 reduction. Herein, a core double-shell structure catalyst (FeS x @ZnS@CoS x) has been rationally fabricated by ternary MOF-on-MOF synthetic strategies combined with subsequent sulfidation treatments. The obtained FeS x @ZnS@CoS x exhibited appealing activity for photocatalytic CO 2 conversion with H 2 O vapor, affording a high CO generation rate of 69.90 μmol g−1 h−1 and CH 4 generation rate of 2.01 μmol g−1 h−1. The outstanding performances could benefit from the distinctive core double-shell structure, which effectively formed dual type II charge transfer channels to improve the separation and migration of photogenerated carriers. Besides, the superstructure of CoS x species can provide abundant active sites to increase CO 2 adsorption and meanwhile enhance the absorption spectrum in the visible light region, facilitating the CO 2 conversion. The possible reduction pathways and key reaction intermediates were revealed by in situ DRIFTS results. This work offers a feasible ternary MOFs strategy to develop multi core–shell structures for high photocatalytic performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 474
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 172844503
- Full Text :
- https://doi.org/10.1016/j.cej.2023.145740