In
this work, a hollow double-shelled architecture, based on n-type
ZnIn2S4 nanosheet-coated p-type CuS hollow octahedra
(CuS@ZnIn2S4 HDSOs), is designed and fabricated
as a p–n heterojunction photocatalyst for selective CO2 photoreduction into CH4. The resulting hybrids
provide rich active sites and effective charge migration/separation
to drive CO2 photoreduction, and meanwhile, CO detachment
is delayed to increase the possibility of eight-electron reactions
for CH4 production. As expected, the optimized CuS@ZnIn2S4 HDSOs manifest a CH4 yield of 28.0
μmol g–1 h–1 and a boosted
CH4 selectivity up to 94.5%. The decorated C60 both possesses high electron affinity and improves catalyst stability
and CO2 adsorption ability. Thus, the C60-decorated
CuS@ZnIn2S4 HDSOs exhibit the highest CH4 evolution rate of 43.6 μmol g–1 h–1 and 96.5% selectivity. This work provides a rational
strategy for designing and fabricating efficient heteroarchitectures
for CO2 photoreduction.
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