Tin‐doped bismuth dendrites for highly efficient electrocatalytic reduction of CO ₂ by using bipolar membrane in ultrathin liquid reactor

Abstract Electrochemical CO 2 reduction reaction is a promising protocol to achieve carbon‐neutral cycle. Herein, we report general strategy regulate the growth of Sn‐doped Bi dendritic electrode with numerous labyrinthine and porous channels provide abundant tips, edges, terraces, low coordination sites for efficient conversion into formate. As result, achieves high partial current density (30 mA/cm ), Faradic efficiency formate (95.5%), long‐term durability (>60 h). Most remarkably, self‐made bipolar membrane can effectually prohibit cross‐over from cathode anode oxidization small organic molecules in promote production on both sides. This work provides helpful insights design electrocatalysts, membrane, ultrathin liquid reactor. image