Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 29, Pages 11918-11922Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202004609
Keywords
CO2 reduction; heterostructures; metal sulfides; photocatalysis
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Funding
- National Research Foundation (NRF) of Singapore [NRF-NRFI2016-04]
- Ministry of Education of Singapore [MOE2017-T2-2-003, RG116/18]
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Hierarchical FeCoS2-CoS2 double-shelled nanotubes have been rationally designed and constructed for efficient photocatalytic CO2 reduction under visible light. The synthetic strategy, engaging the two-step cation-exchange reactions, precisely integrates two metal sulfides into a double-shelled tubular heterostructure with both of the shells assembled from ultrathin two-dimensional (2D) nanosheets. Benefiting from the distinctive structure and composition, the FeCoS2-CoS2 hybrid can reduce bulk-to-surface diffusion length of photoexcited charge carriers to facilitate their separation. Furthermore, this hybrid structure can expose abundant active sites for enhancing CO2 adsorption and surface-dependent redox reactions, and harvest incident solar irradiation more efficiently by light scattering in the complex interior. As a result, these hierarchical FeCoS2-CoS2 double-shelled nanotubes exhibit superior activity and high stability for photosensitized deoxygenative CO2 reduction, affording a high CO-generating rate of 28.1 mu mol h(-1) (per 0.5 mg of catalyst).
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