Halide-modulated Hollow-Fiber Cu penetration electrode boosts Ampere-Level CO2 electroreduction to multicarbon products

Electroreduction of CO2 to chemical fuels is desirable for the economically viable use of CO2 and consumption of renewable electricity. Efficient production of C2+ on Cu-based catalysts remains a challenge. Herein, a copper hollow fiber penetration electrode with a striking C–C coupling capability by virtue of modulating the electronic states through halide ion coordinated adsorption. An efficient C2+ production with a FE of 68.8 % at 2.1 A cm−2 in 3.0 M KI and remained stable during 120-h electrolysis at 2.0 A cm−2, outperforming reported catalytic performance, which is the result of combined effect of penetration effect and halide ion coordinated adsorption, which promotes the transfer of electrons to CO2, reduces the C–C coupling energy and suppresses proton adsorption, thereby reducing hydrogen evolution.