Converting CO into Value-Added Products by Cu O-Based Catalysts: From Photocatalysis, Electrocatalysis to Photoelectrocatalysis.

Converting CO 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 CO catalytic reduction, Cu O has the advantages of abundant reserves, low price and environmental friendliness. Moreover, Cu O has unique adsorption and activation properties for CO , which is conducive to the generation of C products through CC coupling. This review introduces the basic principles of CO reduction and summarizes the pathways for the generation of C , C , and C products. The factors affecting CO reduction performance are further discussed from the perspective of the reaction environment, medium, and novel reactor design. Then, the properties of Cu O-based catalysts in CO reduction are summarized and several optimization strategies to enhance their stability and redox capacity are discussed. Subsequently, the application of Cu O-based catalysts in photocatalytic, electrocatalytic, and photoelectrocatalytic CO reduction is described. Finally, the opportunities, challenges and several research directions of Cu O-based catalysts in the field of CO catalytic reduction are presented, which is guidance for its wide application in the energy and environmental fields is provided.