S型异质结光催化剂因其能够同时促进光生载流子的分离，并优化光催化剂的还原和氧化能力，而被广泛应用于光催化CO₂转化中。尽管S型异质结具有巨大的潜力，但其光催化CO₂转化性能仍然有限，这主要是由于其界面光生载流子迁移缓慢和光利用效率差。本文报道了一种具有0D/2D接触界面的InOOH/ZnIn₂S₄空心球S型异质结，以提高光催化CO₂转化性能。具体来说，空心球结构可以允许入射光在光催化剂内进行多重反射，以增强光利用效率。此外，0D/2D接触界面可以促进光生载流子在InOOH/ZnIn₂S₄空心球S型异质结上的迁移速率。结合原位光照X射线光电子能谱表征和自由基捕获实验，确认了InOOH和ZnIn₂S₄上光生空穴和电子的空间分离，有利于高效利用光生载流子进行光催化CO₂转化。因此，优化后的InOOH/ZnIn₂S₄展示了比原始ZnIn₂S₄高出25.8倍的光催化CO₂转化性能。本工作展示了一种简单而有效的策略，用于提高S型异质结的界面光电荷载流子迁移和光利用效率。

CO₂ reduction technology can promote the resource utilization of carbon and help alleviate global warming and energy supply pressure. It is an effective way to achieve energy conversion and utilization. Covalent organic frameworks (COFs) are porous crystalline materials formed by connecting organic monomers through covalent bonds. They have the characteristics of functional diversity and rich chemical properties. Their advantages, such as high porosity, a wide range of visible light absorption, and excellent charge separation efficiency, give them good potential in CO₂ capture, separation, and conversion. Currently, Cu is a key metal in the catalytic CO₂ reduction reaction (CO₂RR) for the preparation of high-value-added chemicals. The preparation of highly stable and large-pore Cu-based COFs using COFs as an ideal sacrificial template for loading Cu can be used to develop high-performance electrocatalysts and photocatalysts. In this review, we discuss the latest advancements in this field, including the development of various Cu-based COFs and their applications as catalysts for CO₂RR. Here, we mainly introduce the synthesis strategies, some important characterization information, and the applications of electrocatalytic and photocatalytic CO₂ conversion using these previously reported Cu-based COFs.