Atomically Contacted Cs3Bi2Br9 QDs@UiO‐66 Composite for Photocatalytic CO2 Reduction

Abstract Metal halide perovskite quantum dots (QDs) are widely studied in the field of photocatalytic CO 2 due to their strong light absorption and long carrier migration length. However, it can not exhibit high catalytic performance because of the radiative recombination and the lack of effective catalytic sites. Metal organic frameworks (MOFs) encapsulated QDs can not only solve the aforementioned problems, but also maintain their own unique characteristics with ultra‐high specific surfaces area and abundant metal sites. In this work, lead‐free bismuth‐based halide perovskite QDs are encapsulated into Zr‐based MOF (UiO‐66), which combines the advantages with high power conversion efficiency of QDs and the high surface area and porosity of UiO‐66. In addition, benefiting from the close contact between the Cs 3 Bi 2 Br 9 QDs and the UiO‐66 enables the photogenerated electrons in the QDs to be rapidly transferred to the MOF. As a result, the Cs 3 Bi 2 Br 9 @UiO‐66 composite exhibits a higher yield for photocatalytic CO 2 reduction than that of the prepared large‐sized composite of Cs 3 Bi 2 Br 9 and UiO‐66.