Boosting CO2 photoreduction by synergistic optimization of multiple processes through metal vacancy engineering
The photoreduction of greenhouse gas CO2 using photocatalytic technologies not only benefits en-vironmental remediation but also facilitates the production of raw materials for chemicals.Howev-er,the efficiency of CO2 photoreduction remains generally low due to the challenging activation of CO2 and the limited light absorption and separation of charge.Defect engineering of catalysts rep-resents a pivotal strategy to enhance the photocatalytic activity for CO2,with most research on met-al oxide catalysts focusing on the creation of anionic vacancies.The exploration of metal vacancies and their effects,however,is still underexplored.In this study,we prepared an 1n2O3 catalyst with indium vacancies(VIn)through defect engineering for CO2 photoreduction.Experimental and theo-retical calculations results demonstrate that Vm not only facilitate light absorption and charge sepa-ration in the catalyst but also enhance CO2 adsorption and reduce the energy barrier for the for-mation of the key intermediate*COOH during CO2 reduction.Through metal vacancy engineering,the activity of the catalyst was 7.4 times,reaching an outstanding rate of 841.32 μmol g-1 h-1.This work unveils the mechanism of metal vacancies in CO2 photoreduction and provides theoretical guidance for the development of novel CO2 photoreduction catalysts.
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