Dual Electric Fields Enrich and Stabilize Intermediates for Efficient Electrochemical CO2 Reduction to Multi-Carbon Products

Electrochemical reduction of CO 2 , a technology with great potential for renewable energy storage and climate change mitigation, depends on critical C─C coupling steps in CO 2 RR to ensure efficient high-value hydrocarbon production. In this work, a local interface electric field and a tip-induced electric field are constructed on Ag-embedded Cu nanoneedle arrays to enhance the concentration of the *CO intermediate and regulate the adsorption of key intermediates, respectively. This optimization of the reaction microenvironment promotes the deep reduction of the *CO intermediate into multi-carbon products (C 2+ ), with a faradaic efficiency of 83.7% and a C 2+ local current density of −526 mA cm −2 within gas-fed flow cells. Experimental evidence and simulations validate that the interface electric field of the Cu-Ag bimetallic catalyst increased surface *CO coverage, substantially lowering the formation barrier for *CHO intermediate, and the tip-induced electric field that can stabilize *CO intermediate and suppress hydrogen evolution, promoting the C─C coupling process. The formation of the dual electric fields profoundly induced local environments and ultimately, the dominant C 2+ product, which offers significant design guidelines for adjusting the supply and demand balance of reaction intermediates.