Recent advancements related to silver-based electrocatalysts for carbon dioxide reduction reaction to carbon monoxide

Electrochemical CO 2 reduction reaction (CO 2 RR) is a progressive step toward the reduction of planetary carbon footprint. In this way, CO 2 can be valorized into valuable products, and particularly, CO 2 can be reduced to gaseous products (e.g. CO or methane) or into liquid products (i.e. C 1 , C 2 , C 3 , etc.). Interestingly, CO 2 RR and hydrogen reduction reaction (HER) are competitive reactions; therefore, syngas (CO + H 2 ) can also be produced at different H 2 :CO ratios. Depending on the transition metal used as an electrocatalyst for the CO 2 RR, the selectivity toward a specific product can be properly tuned. In this opinion, the attention is focused on the reduction of CO 2 to CO using Ag-based electrocatalysts. Reaction mechanisms to produce H 2 , CO, and formate are described and highlighted. The effect of the morphology is described, and the performance of Ag-based electrocatalysts toward CO 2 -to-CO and syngas production is presented, focusing on the recent available literature.