Affiliation:
1. State Key Laboratory of Advanced Chemical Power Sources Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Tianjin Key Laboratory of Biosensing and Molecular Recognition Haihe Laboratory of Sustainable Chemical Transformations College of Chemistry Nankai University Weijin Rd. 94 Tianjin 300071 China
2. Ultrafast Electron Microscopy Laboratory Key Laboratory of Weak-Light Nonlinear Photonics (Ministry of Education) School of Physics Nankai University Weijin Rd. 94 Tianjin 300071 China
Abstract
AbstractPerovskite quantum dots (QDs) have shown attractive prospects in the field of visible photocatalysis, especially in the synthesis of high value‐added chemicals. However, under aerobic conditions, the stable operation of QD catalysts has been limited by the reactive oxygen species (ROS) generated by photoexcitation, especially superoxide species O2⋅−. Here, we propose a strategy of Ce3+ doping in perovskite QDs to guide superoxide species for photocatalytic oxidation reactions. In C(sp3)−H bond oxidation of hydrocarbons, superoxide species were rapidly generated and efficiently utilized on the surface of perovskite QDs, which achieves the stable operation of the catalytic system and obtains a high product conversion rate (15.3 mmol/g/h for benzaldehydes). The mechanism studies show that the strong Ce‐oxygen affinity accelerates the relaxation process of photoinduced exciton transfer to superoxide species and inhibits the radiative recombination pathway. This work provides a new idea of utilizing oxygen species on perovskite surface and broadens the design strategy of high‐performance QD photocatalysts.
Funder
Natural Science Foundation of Tianjin Municipality
Cited by
1 articles.
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