Abstract
Inspired by the natural photosynthesis systems,the integrated harnessing and conversion of CO2 present a promising solution for addressing the ever-rising global atmospheric concentration of CO2.Hollow multi-shelled structured(HoMS)photocatalysts,featuring alternating shells and cavities,have recently gained recognition as efficient nano-reactors for capturing CO2 molecules and facilitating effective photoreduction within these hierarchical structures,leveraging the preeminent enrichment effect.In this work,to augment the photocatalytic efficacy of HoMS in CO2 treatment,highly dispersed CuxO nanoparticles(NPs)were incorporated on the CeO2 shells through a polymer-assisted impregnation method to create more active sites and strengthen the interaction between the hetero-shells and CO2 molecules.The photoreduction of the CO2-to-CO rate under a diluted CO2(15％,volume fraction)atmosphere is improved by the introduction of CuxO NPs,with the highest CO yielding rate reaching 120 μmol·h-1·g-1 without any sacrificial reagents.Further comparison experiments and theoretical calculations reveal that the CuxO NPs promote the adsorption of CO2 molecules in HoMS,accelerate the charge transfer efficiency,and stabilize the surface oxygen vacancies(Ovs)during the photoreduction CO2 conversion process.We hope these easy-to-prepare HoMS nanoreactors can contribute to the effective enrichment and valorization of CO2 in industrial exhaust gases.
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