Abstract:Electrochemical energy conversion provides a clean method to realize the conversion between electrical energy and chemical energy, and it is an important way to achieve the "dual carbon" goal. Developing high-performance catalysts is the key to improve the efficiency of electrochemical energy conversion. Single-atom catalysts have shown enormous application prospects in the field of electrocatalytic energy conversion. Copper (Cu) plays an important role in electrochemical energy conversion with its advantages, such as high conductivity, abundant reserves, and environmental friendliness. This article summarizes the synthesis strategies of Cu single-atom catalysts (SACs), such as high-temperature pyrolysis, wet chemical methods, chemical vapor deposition, electrochemical deposition, etc. The progress of these materials in electrocatalytic carbon dioxide reduction (CO2RR), oxygen reduction reaction (ORR), water electrolysis hydrogen evolution reaction (HER), and nitrogen electrochemical reduction (NRR) are also introduced. Finally, the current challenges and future applications of Cu SACs in electrocatalysis are discussed.