CsPbBr3 perovskite nanocrystals anchoring on monolayer MoS2 nanosheets for efficient photocatalytic CO2 reduction

Abstract Photocatalytic CO2 conversion to valuable fossil fuels has been demonstrated to be a promising approach to reduce emissions of CO2 and produce renewable energy, which primarily depends on developing the high efficiency of charge separation photocatalysts. Herein, CsPbBr3, one typical kind of all-inorganic perovskite nanocrystal, is immobilized on monolayer MoS2 nanosheets to construct a new and ideal CsPbBr3/MoS2 photocatalyst in the application of CO2 photoreduction. In comparison with pure CsPbBr3, CsPbBr3/MoS2 heterostructures possessed a specific electric field to more efficiently separate charges and generated more active sites for facilitating CO2 activation, resulting in 3.0 and 2.4 times yields for CO2 photoreduction to CH4 and CO, respectively. Detailed characterization methods such as photoluminescence, surface photovoltage spectroscopy and theory calculations indicate the vivid illustrations of photogenerated carries separation which contributes to the improved photocatalytic CO2 conversion efficiency. The present investigation is anticipated to provide a new way for fabricating highly efficient perovskite-based photocatalyst in solar-energy-driven applications.