In this paper, Tin-Cu alloy was deposited on carbon paper by electrodeposition in aqueous solution, which was employed as a cathode for electrochemical reduction of CO2 to formate, and how to obtain big catalytic current density, high efficiency and high production rate of formate were explored and discussed. Tin-Cu alloys with different compositions were characterized by morphology, structure, and composition. The electrochemical behavior of the alloys was measured by EIS and CV analysis. In addition, FE, partial current density (PCD), and concentration of HCOO− on the alloys were investigated and compared with those on Sn and Cu electrodes.
 S. Rasul, D.H. Anjum, A. Jedidi, Y. Minenkov, L. Cavallo, K. Takanabe, Angew. Chem. Int. Ed., 54,2146(2015).
 Q. Lu, J. Rosen, Y. Zhou, G.S. Hutchings, Y.C. Kimmel, J.G. Chen, F. Jiao, Nat. Commun., 5,4242(2014).
 Q. Shen, Z.F. Chen, X.F. Huang, M.C. Liu, G.H. Zhao, Environ. Sci. Technol., 49,5828(2015).
 X.Q. Min, M.W. Kanan, J. Am. Chem. Soc., 137, 4701(2015).