Abstract
The photoreduction of CO2 using solar energy to produce energy-efficient fuels is a sustainable technol-ogy that addresses energy needs while reducing carbon emissions.However,synthesizing efficient and robust photocatalysts for this process is challenging.This study introduces a viable approach for highly selective CO2 photoreduction to CH4 production by integrating defect-enriched BiOIO3(DEBI)with a Ti3C2(TC)MXene co-catalyst,forming an efficient 2D/2D Schottky-type heterostructure.The DEBI,enhanced with precise defect engineering,showed improved light absorption and charge separation efficiency.In tandem,the TC MXene co-catalyst facilitated rapid electron transfer and significantly minimized charge recombination.Consequently,the DEBI/TC-2 heterostructure,with an optimal 2 wt％TC MXene loading,achieved a CH4 yield of 52.8 μmol h-1 g-1,representing a remarkable 20.5-and 6.3-fold increase over pristine BiOIO3 and DEBI,respectively.The Schottky-type 2D/2D heterostructure also demonstrated an impressive apparent quantum yield of 0.72％,99％CH4 selectivity over H2 generation,and remarkable stability across multiple cycles.This study underscores the synergistic advantages of defect engineering and MXene co-catalyst integration in a single system,proposing a novel direction for designing highly efficient photocatalysts for solar-driven CO2 reduction in energy-efficient fuel production.
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