研究目的

Investigating the therapeutic effects of a specific herbal medicine on a particular disease.

研究成果

Solar-driven CO2 reduction was successfully realized over ZnS:Ni colloidal nanocrystals with an optimal doping amount of 0.1 %. Loading with Cd2+, the HCOOH production over ZnS:Ni colloidal nanocrystals has reached up to 427 μmol·h-1 under 300W Xe lamp and 138 μmol·h-1 (selectivity ~99%) under 1 sun. The AQY at 340 nm in the UV region and at 420 nm in the visible light region are 59.1 % and 5.6 %, respectively, at the front ranks in the currently reported photocatalytic CO2RR systems. The reason why photoconversion of CO2 is optimized at a small doping amount (0.1 %) of Ni is explained as a compromise of increased light absorption and decreased Sv. Demonstrated by PL, ESR and XPS, it was found the Ni dopants can modulate the Sv amount in the loose structured ZnS:Ni colloidal architecture. Light doping of Ni will maintain the abundant Sv, suppressing the charge recombination in the bulk; heavier doping of Ni will cause the diminishing of Sv, unfavorable for the CO2RR. Thus, only appropriate doping amount can give rise to the optimal performance of the photocatalytic CO2RR. The discovery offers a unique insight into the doping strategy and modulation of anion vacancies on the photocatalysts towards CO2 reduction.

研究不足

The technical and application constraints of the experiments, as well as potential areas for optimization.