Encapsulating Perovskite Quantum Dots in Iron‐Based Metal–Organic Frameworks (MOFs) for Efficient Photocatalytic CO2 Reduction

• Published in: Angewandte Chemie International Edition Vol. 58; no. 28; pp. 9491 - 9495
• Main Authors: Wu, Li‐Yuan, Mu, Yan‐Fei, Guo, Xiao‐Xuan, Zhang, Wen, Zhang, Zhi‐Ming, Zhang, Min, Lu, Tong‐Bu
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 08.07.2019
• Edition: International ed. in English
• Subjects: Active sites; Carbon dioxide; Catalysis; Catalytic activity; CO2 reduction; Encapsulation; Iron; Lead; Lead compounds; Metal halides; Metal-organic frameworks; metal–organic frameworks (MOFs); perovskite quantum dots; Perovskites; Photocatalysis; Photocatalysts; Photosynthesis; Quantum dots; Reduction; Stability
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.201904537

Improving the stability of lead halide perovskite quantum dots (QDs) in a system containing water is the key for their practical application in artificial photosynthesis. Herein, we encapsulate low‐cost CH3NH3PbI3 (MAPbI3) perovskite QDs in the pores of earth‐abundant Fe‐porphyrin based metal organic framework (MOF) PCN‐221(Fex) by a sequential deposition route, to construct a series of composite photocatalysts of MAPbI3@PCN‐221(Fex) (x=0–1). Protected by the MOF the composite photocatalysts exhibit much improved stability in reaction systems containing water. The close contact of QDs to the Fe catalytic site in the MOF, allows the photogenerated electrons in the QDs to transfer rapidly the Fe catalytic sites to enhance the photocatalytic activity for CO2 reduction. Using water as an electron source, MAPbI3@PCN‐221(Fe0.2) exhibits a record‐high total yield of 1559 μmol g−1 for photocatalytic CO2 reduction to CO (34 %) and CH4 (66 %), 38 times higher than that of PCN‐221(Fe0.2) in the absence of perovskite QDs. Pores and dots: CH3NH3PbI3 (MAPbI3) perovskite quantum dots were encapsulated in the pores of iron‐porphyrin derived metal–organic frameworks (MOFs) of PCN‐221(Fex) to give an efficient photocatalytic system, which has significantly enhanced catalytic efficiency and stability for visible‐light‐driven CO2 reduction using water as an electron source.