Ag-MOF-derived 3D Ag dendrites used for the efficient electrocatalytic reduction of CO2 to CO

Ag-based electrodes have emerged as important candidates for the industrial electrochemical CO 2 reduction reaction (eCO 2 RR) to form CO. Herein, an intrinsic versatile Ag electrode has been derived in situ from Ag-MOF on Ag foam (denoted as ER-AF), which exhibits the highest current density (57.2 mA cm −2 ) at a potential of −1.15 V vs. RHE reported to date for the formation of CO in a commonly used H-type cell. ER-AF has multiple-roles: The 3D dendrite structure promotes mass diffusion; the rich edges sites favor CO 2 adsorption and conversion, and the highly exposed (111) facet facilitates the desorption of CO. Their cooperating functions result in the remarkable performance of ER-AF in the eCO 2 RR to form CO. This work offers an effective strategy to achieve high eCO 2 RR activity and selectivity by assembling the active and stable sites together on the MOF-derived materials.