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Abstract Electrochemical carbon dioxide (CO ) reduction reaction (CO RR) is an attractive approach to deal with the emission of CO and to produce valuable fuels and chemicals in a carbon-neutral way. Many efforts have been devoted to boost the activity and selectivity of high-value multicarbon products (C ) on Cu-based electrocatalysts. However, Cu-based CO RR electrocatalysts suffer from poor catalytic stability mainly due to the structural degradation and loss of active species under CO RR condition. To date, most reported Cu-based electrocatalysts present stabilities over dozens of hours, which limits the advance of Cu-based electrocatalysts for CO RR. Herein, a porous chlorine-doped Cu electrocatalyst exhibits high C Faradaic efficiency (FE) of 53.8 % at −1.00 V versus reversible hydrogen electrode (V ). Importantly, the catalyst exhibited an outstanding catalytic stability in long-term electrocatalysis over 240 h. Experimental results show that the chlorine-induced stable c

Chlorine
Co-reduction-reaction-2
Copper
Electrocatalysis
Ixed-oxidation-states
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