Abstract
Bromide-based metal halide perovskites (MHPs) are promising photocatalysts with strong blue-green light absorption. Composite photocatalysts of MHPs with MIL-100(Fe), as a powerful photocatalyst itself, have been investigated to extend the responsiveness towards red light. The composites, with a high specific surface area, display an enhanced solar light response, and the improved charge carrier separation in the heterojunctions is employed to maximize the photocatalytic performance. Optimization of the relative composition, with the formation of a dual-phase CsPbBr3 to CsPb2Br5 perovskite composite, shows an excellent photocatalytic performance with 20.4 μmol CO produced per gram of photocatalyst during one hour of visible light irradiation.
Highlights
The capture of CO2 and further conversion of this greenhouse gas into chemical fuels (CO, CH4, CH3 OH, etc.) has been a hot topic during the past decades [1]
With an increasing amount of MIL-100(Fe) loaded in the composites, we observe a gradual transformation of CsPbBr3 (PDF#18-0364) to CsPb2 Br5 (PDF#25-0211)
This phase transformation could be ascribed to the excessive H2 O in the Fe precursor, which partially converts the CsPbBr3
Summary
The capture of CO2 and further conversion of this greenhouse gas into chemical fuels (CO, CH4 , CH3 OH, etc.) has been a hot topic during the past decades [1]. The reduction of CO2 is complicated by its inherent chemical stability [2,3]. Despite this issue, photocatalytic CO2 reduction is still seen as one of the promising ways to sustainably produce chemicals [4]. Metal-organic frameworks (MOFs) have been one of the fastest developing materials, exhibiting unique properties such as structural flexibility, large specific surface area, tunable but uniform cavities, and easy ligand functionalization [5,6]. MOF-5 was the first MOF reported to have photocatalytic activity in UV-induced phenol photodegradation [7]
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