2D/2D Schottky heterojunction of in-situ growth FAPbBr3/Ti3C2 composites for enhancing photocatalytic CO2 reduction

Mimicking the natural photosynthesis process to convert carbon dioxide into value-added chemicals is vital to solving both the climate crisis worldwide and the depletion of fossil fuels. Herein, we explore the synthesis of 2D FAPbBr 3 nanoplate combined with 2D Ti 3 C 2 nanosheet to form a 2D/2D FAPbBr 3 /Ti 3 C 2 Schottky heterojunction using facile hot-injection and in-situ growth approaches. The Schottky heterojunction of FAPbBr 3 /Ti 3 C 2 over large interfacial contact provides abundant channels for transferring photogenerated carriers from FAPbBr 3 nanoplate to Ti 3 C 2 nanosheet. The experimental results showed a CO yield of 93.82 μmol·g −1 ·h −1 with ethyl acetate/deionization water as a sacrificial reagent for FAPbBr 3 /Ti 3 C 2 composite, which was 1.25-fold enhancement that on pristine FAPbBr 3 nanoplates. The large 2D heterointerface can efficiently accelerate the spatial separation and transfer of photogenerated carriers and result in the superior photocatalytic activity and favorable stability of FAPbBr 3 /Ti 3 C 2 photocatalysts, which are proved by in-situ X-ray photoelectron spectroscopy, photoluminescence, transient absorption spectra, and Mott-Schottky measurement. Thus, this work unveils that 2D/2D Schottky heterostructures would significantly improve the reaction activities of halide perovskite-based photocatalysts.