The increasing CO 2 concentration in the atmosphere has caused profound environmental issues such as global warming. The use of CO 2 as a feedstock to replace traditional fossil sources holds great promise to reduce CO 2 emissions. The electrochemical conversion of CO 2 has attracted much attention because it can be powered by renewable sources such as solar energy. In this review article, we provide insight into the important parameters when studying CO 2 RR and give a comprehensive review on the description of synthesis methods with electrocatalytic CO 2 reduction over bimetallic copper-based materials. Due to the important bibliographic data on Cu bimetallic materials, we have limited this review to Sn, In, Pd, Zn and Ag. At the end of this review, challenges and perspectives for further upgrading have been included to briefly highlight the important future considerations of this rapidly growing technology.