Sn-based film electrodeposited on Ag foil for selective electrochemical CO 2 reduction to CO.

Electrochemical CO 2 reduction (ECR) to valuable chemicals and fuels using renewable energy is a promising way to reduce carbon emission. Herein, Sn-based films were electrodeposited on Ag foil surfaces (Sn/Ag- y ) for selective ECR to CO, where y represented the concentration of SnCl 2 in the electrodeposition bath. The Sn/Ag-20 electrode achieved a high CO faradaic efficiency of 96.0% with a current density of 69.3 mA cm -2 . The enhanced catalytic performance could be attributed to appropriate superficial properties, large electrochemical active surface areas, low charge transfer resistance, efficient stabilization capacity of the CO 2 ˙ - intermediates, and suitable combination with electrolytes.