Electrochemically Driven Formation of Sponge‐Like Porous Silver Nanocubes Toward Efficient CO2 Electroreduction to CO

Abstract Electrochemical conversion of CO 2 into valuable products by utilizing renewable electricity is a thriving research field. For electrochemical reduction of CO 2 to CO, uniform sponge‐like porous Ag nanocubes (SPC‐Ag) integrated on carbon paper are prepared by using an electrochemically driven method. The SPC‐Ag has a 3 D porous structure and a large specific surface area, which affords abundant active sites for the CO 2 reduction reaction (CO 2 RR), as well as reducing impedance to accelerate the CO 2 RR kinetics. This distinctive organization affords SPC‐Ag with outstanding electrocatalytic performance for CO 2 reduction to CO. High faradaic efficiency (>90 %) and large partial current density for CO with excellent durability are observed in a wide potential window, with a maximum value of 93 % at −0.9 V versus reversible hydrogen electrode.