Amino Acid-Assisted Preparation of Homogeneous PbS/CsPbBr3Nanocomposites for Enhanced Photoelectrocatalytic CO2Reduction

As a potential candidate for photocatalytic CO2reduction, CsPbX3perovskite nanocrystals (PNCs) have attracted enormous attention due to their suitable energy band structure and large molar extinction coefficient for visible light. However, the catalytic performance on CO2reduction is greatly limited due to the intrinsically fast radiative recombination and poor stability of PNCs. In this work, PbS nanoparticles are uniformly anchored on CsPbBr3PNCs with the assistance of a bridged amino acid due to the directed interaction between −COO–(−NH3+) and Pb2+(Br–). Because of the small lattice mismatch between PbS and CsPbBr3, the introduction of PbS significantly quenches the emission of CsPbBr3and boosts the interfacial charge transfer, thereby resulting in an enhanced photoelectrocatalytic CO2reduction rate of ∼2.94 and 0.36 μmol cm–2h–1for CO and CH4products, which are ∼2.4 times higher than that of pristine CsPbBr3PNCs, respectively. This work provides a universal strategy of constructing homogeneous nanocomposites for catalytic applications.