The photocatalytic efficiency of lead-free Bi-based halide perovskites,such as Cs_(3)Bi_(2)X_(9)(X=Br,I)for CO_(2)reduction is often hindered by self-aggregation and insufficient oxidation ability.In this work,a visib...The photocatalytic efficiency of lead-free Bi-based halide perovskites,such as Cs_(3)Bi_(2)X_(9)(X=Br,I)for CO_(2)reduction is often hindered by self-aggregation and insufficient oxidation ability.In this work,a visible-light-driven(λ>420 nm)Z-scheme heterojunction photocatalyst composed of 0D Cs_(3)Bi_(2)I_(9) nanoparticles on 1D WO_(3) nanorods for photocatalytic CO_(2)reduction and water oxidation is synthesized using an in situ growing approach.The resulting 0D/1D Cs_(3)Bi_(2)I_(9)/WO_(3) Z-scheme heterojunction photocatalyst exhibits a visible-light-driven photocatalytic CO_(2)reduction performance for selective CO production,achieving a selectivity of 98.7%and a high rate of 16.5µmol/(g·h),approximately three times that of pristine Cs_(3)Bi_(2)I_(9).Furthermore,it demonstrates decent stability in the gas-solid photocatalytic CO_(2)reduction system.The improved performance of Cs_(3)Bi_(2)I_(9)/WO_(3) is attributed to the formation of the 0D/1D Z-scheme heterojunction,which facilitates charge transfer,reduces charge recombination,and maintains the active sites of both 0D Cs_(3)Bi_(2)I_(9) for CO_(2)reduction and 1D WO_(3) for water oxidation.This work provides valuable insights into the potential of morphological engineering and the design of simultaneous Z-scheme heterojunction for lead-free halide perovskites.展开更多
基金supported by the National Key R&D Program of China(Grant No.2022YFA1505000)the Key R&D Program of Shaanxi Province,China(Grant No.2024CY-GJHX-28)+2 种基金the National Natural Science Foundation of China(Grant No.52302308)the Outstanding Youth Science Foundation Project of the National Natural Science Foundation of China(Overseas)the Qinchuangyuan Cited High-Level Innovative and Entrepreneurial Talents Project,China(Grant No.QCYRCXM-2022-143).
文摘The photocatalytic efficiency of lead-free Bi-based halide perovskites,such as Cs_(3)Bi_(2)X_(9)(X=Br,I)for CO_(2)reduction is often hindered by self-aggregation and insufficient oxidation ability.In this work,a visible-light-driven(λ>420 nm)Z-scheme heterojunction photocatalyst composed of 0D Cs_(3)Bi_(2)I_(9) nanoparticles on 1D WO_(3) nanorods for photocatalytic CO_(2)reduction and water oxidation is synthesized using an in situ growing approach.The resulting 0D/1D Cs_(3)Bi_(2)I_(9)/WO_(3) Z-scheme heterojunction photocatalyst exhibits a visible-light-driven photocatalytic CO_(2)reduction performance for selective CO production,achieving a selectivity of 98.7%and a high rate of 16.5µmol/(g·h),approximately three times that of pristine Cs_(3)Bi_(2)I_(9).Furthermore,it demonstrates decent stability in the gas-solid photocatalytic CO_(2)reduction system.The improved performance of Cs_(3)Bi_(2)I_(9)/WO_(3) is attributed to the formation of the 0D/1D Z-scheme heterojunction,which facilitates charge transfer,reduces charge recombination,and maintains the active sites of both 0D Cs_(3)Bi_(2)I_(9) for CO_(2)reduction and 1D WO_(3) for water oxidation.This work provides valuable insights into the potential of morphological engineering and the design of simultaneous Z-scheme heterojunction for lead-free halide perovskites.
