Exploring affordable cocatalysts with high-performance for boosting charge separation and CO2 activation is an effective strategy to reinforce CO2 photoreduction efficiency. Herein, the well-defined Co9S8 cages are exploited as a...
Light-driven
valorization conversion of CO2 is an encouraging
carbon-negative pathway that shifts energy-reliance from fossil fuels
to renewables. Herein, a hierarchical urchin-like hollow-TiO2@CdS/ZnS (HTO@CdS/ZnS) Z-scheme hybrid synthesized by an in situ
self-assembly strategy presents superior photocatalytic CO2-to-CO activity with nearly 100% selectivity. Specifically, benefitting
from the reasonable architectural and interface design, as well as
surface modification, this benchmarked visible-light-driven photocatalyst
achieves a CO output of 62.2 μmol·h–1 and a record apparent quantum yield of 6.54% with the Co(bpy)3
2+ (bpy = 2,2′-bipyridine) cocatalyst. It
rivals all the incumbent selective photocatalytic conversion of CO2 to CO in the CH3CN/H2O/TEOA reaction
systems. Specifically, the addition of HTO and stabilized ZnS enables
the photocatalyst to effectively upgrade optical and electrical performances,
contributing to efficient light-harvesting and photogenerated carrier
separation, as well as interfacial charge transfer. The tremendous
enhancement of photocatalytic performance reveals the superiority
of the Z-scheme heterojunction assembled from HTO and CdS/ZnS, featuring
the inner electric field derived from the band bending of HTO@CdS/ZnS
make CdS resistant to photocorrosion. This study allows access to
inspire studies on rationally modeling and constructing diverse heterostructures
for the storage and conversion of renewables and chemicals.
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