Converting CO₂ into value-added products by photocatalysis, electrocatalysis, and photoelectrocatalysis is a promising method to alleviate the global environmental problems and energy crisis. Among the semiconductor materials applied in CO₂ catalytic reduction, Cu₂O has the advantages of abundant reserves, low price and environmental friendliness. Moreover, Cu₂O has unique adsorption and activation properties for CO₂, which is conducive to the generation of C₂₊ products through CC coupling. This review introduces the basic principles of CO₂ reduction and summarizes the pathways for the generation of C₁, C₂, and C₂₊ products. The factors affecting CO₂ reduction performance are further discussed from the perspective of the reaction environment, medium, and novel reactor design. Then, the properties of Cu₂O-based catalysts in CO₂ reduction are summarized and several optimization strategies to enhance their stability and redox capacity are discussed. Subsequently, the application of Cu₂O-based catalysts in photocatalytic, electrocatalytic, and photoelectrocatalytic CO₂ reduction is described. Finally, the opportunities, challenges and several research directions of Cu₂O-based catalysts in the field of CO₂ catalytic reduction are presented, which is guidance for its wide application in the energy and environmental fields is provided.

中文翻译：

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Cu2O基催化剂将CO2转化为增值产品：从光催化、电催化到光电催化

通过光催化、电催化和光电催化将CO ₂转化为具有附加值的产品是缓解全球环境问题和能源危机的一种有前途的方法。在应用于CO ₂催化还原的半导体材料中，Cu ₂ O具有储量丰富、价格低廉、环境友好等优点。此外，Cu ₂ O对CO _{2具有独特的吸附和活化性能，有利于C}  C偶联生成C ₂₊产物。_{本综述介绍了 CO 2}还原的基本原理并总结了 C ₁ , C的生成途径₂和 C ₂₊产品。从反应环境、介质和新型反应器设计的角度进一步讨论了影响CO ₂还原性能的因素。然后，总结了Cu ₂ O 基催化剂在 CO ₂还原中的性能，并讨论了几种提高其稳定性和氧化还原能力的优化策略。随后，描述了Cu ₂ O基催化剂在光催化、电催化和光电催化CO _{2还原中的应用。最后，Cu 2 O基催化剂在CO 2}领域的机遇、挑战和几个研究方向介绍了催化还原，为其在能源和环境领域的广泛应用提供了指导。