Metal–Organic Framework Derived Cu−Ag Interface for Selective Carbon Monoxide Electroreduction to Acetate

Abstract

Electrochemical carbon monoxide reduction reaction (CORR) is a potential way to obtain high‐value multi‐carbon (C ₂₊) products. However, achieving high selectivity to acetate is still a challenge. Herein, we develop a two‐dimensional Ag‐modified Cu metal–organic framework (Ag _0.10@CuMOF‐74) that demonstrates Faradaic efficiency (FE) for C ₂₊ products up to 90.4 % at 200 mA cm ⁻² and an acetate FE of 61.1 % with a partial current density of 122.2 mA cm ⁻². Detailed investigations show that the introduction of Ag on CuMOF‐74 favors the generation of abundant Cu−Ag interface sites. In situ attenuated total reflection surface enhanced infrared absorption spectroscopy confirms that these Cu−Ag interface sites improve the coverage of *CO and *CHO and the coupling between each other and stabilize key intermediates *OCCHO and *OCCH ₂, thus significantly promoting to the acetate selectivity on Ag _0.10@CuMOF‐74. This work provides a high‐efficiency pathway for CORR to C ₂₊ products.