Abstract
CsPbBr3 is considered as a promising photocatalyst owning to its excellent photoelectronic characteristics. However, the photocatalytic activity is still unsatisfactory due to its narrow light absorption range, weak electron reduction potential, and poor water-resistance. In this work, a three-dimensional porous melamine foam (MF) supported CsPbBr3?xIx was prepared via facile anti-solvent (isopropanol, IPA) and ion doping strategies, which successfully realize efficient photocatalytic CO2 reduction under liquid-phase H2O medium. The anti-solvent strategy enables uniform distribution of perovskite crystals on MF surface, which is beneficial to the increase of specific surface area and active sites. The iodine ion (I-) replacement can enhance light absorption and electron reduction capacity of CsPbBr3, contributing to the CO2 photoreduction. Under simulated solar irradiation, powdery CsPbBr3 exhibits no photocatalytic activity owing to its quick degradation in H2O medium. Interestingly, MF assisted perovskites presents the enhanced performance, with 195.97 μmol g?1·h?1 of product yield for CsPbBr2I (IPA), which is 22.0 times higher than that of MF/CsPbBr3. Moreover, the excellent photothermal recoverable effect and surface hydrophobicity of MF/CsPbBr2I (IPA) result in a long-period and stable photocatalytic CO2 reduction with no evident decrease of photocatalytic activity during 42 h.
NSTL
Elsevier