Enhanced Solar-Driven Gaseous CO2 Conversion by CsPbBr3 Nanocrystal/Pd Nanosheet Schottky-Junction Photocatalyst

In this report, a novel zero-dimensional CsPbBr 3 nanocrystal (CsPbBr 3 NC)/two-dimensional Pd nanosheet (Pd NS) composite photocatalyst is prepared to afford efficient and stable photocatalytic gaseous CO 2 reduction in the presence of H 2 O vapor under visible light illumination. Pd NS herein acts as an electron reservoir to quickly separate the electron–hole pairs in CsPbBr 3 NC through a Schottky contact, and provides an ideal site for CO 2 reduction reactions. A highest electron consumption rate of 33.79 μmol g –1 h –1 is achieved by the CsPbBr 3 NC/Pd NS composite, which corresponds to a 2.43-fold enhancement over pristine CsPbBr 3 NC (9.86 μmol g –1 h –1 ), thus providing a practical and universal solution for the halide perovskite materials to boost the photocatalytic performance through semiconductor/metal design.