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Over the last 5 years, metal halide perovskites (MHPs) have emerged as promising photocatalysts for CO 2 reduction because of their extraodinary visible-lightharvesting capabilities and appropriate band structure. However, the CO 2 photoreduction activity of pristine MHPs is still unsatisfactory because of the phase instability, serious radiative recombination, and insufficient surface-active sites. This Perspective summarizes the strategies employed in recent studies for enhancing the photocatalytic CO 2 reduction performance of MHPs from the standpoint of structure engineering, which includes composition/dimension regulation, surface modification, and heterostructure construction. The relationship between the structure (composition, dimension, and shape) and photocatalytic performance is established, which is instructive for exploiting highly efficient perovskite-based photocatalysts in artificial photosynthesis applications. Further, some important challenges and future prospects of MHPs in this field are proposed and discussed.

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Metal-halide perovskite quantum dots (QDs) have emerged as a potential photocatalyst owing to their remarkable optoelectronic properties. However, the poor stability and insufficient charge transportation efficiency of this type of materials have hindered their applications in the photocatalysis field. Herein, we decorated CsPbBr3 QDs on two-dimensional (2D) ultrathin g-C3N4 (UCN) nanosheets to develop a 0D/2D CsPbBr3/UCN composite photocatalyst. The introduction of UCN can not only improve the stability of CsPbBr3 QDs by passivating the surface ligands of CsPbBr3 QDs, but also facilitate the charge transfer due to the suited band gap alignment. Consequently, the obtained CsPbBr3/UCN heterostructure exhibited superior photocatalytic performance to both pristine CsPbBr3 QDs and UCN. This work has provided an efficient strategy for the design of CsPbX3-based heterostructure with high stability and photocatalytic activity.