The concept of photocatalytic reduction of carbon dioxide (CO₂) into solar fuels has received considerable attention. This approach could resolve the environmental issue and the energy crisis synergistically. In this study, several possible products and reaction pathways of CO₂ reduction that might happen under different conditions are summarized. Various photocatalysts and their mechanism for the reduction of CO₂ into C₁ and C₂₊ products are highlighted and overviewed. In addition, we address the yet unresolved questions concerning the insight of the mechanism and tailoring photocatalysts, which can bring more insights for enhancing photocatalytic efficiency. Finally, we provide the remaining challenges and prospects for the development of photocatalytic CO₂ reduction.

将二氧化碳（CO ₂）光催化还原成太阳能燃料的概念受到了相当大的关注。这种方法可以协同解决环境问题和能源危机。在这项研究中，总结了在不同条件下可能发生的几种可能的CO ₂还原产物和反应途径。各种光催化剂及其将CO ₂还原为C ₁和C ₂₊的机理产品突出显示和概述。此外，我们解决了有关机理和定制光催化剂的见解尚未解决的问题，这些问题可以为提高光催化效率带来更多见解。最后，我们提供了光催化还原CO ₂的剩余挑战和前景。