“…[3] In particular, Bi nanostructure exhibits considerable benefits for the safe, affordable, and high selectivity. [4] Up to now, substantial endeavors have been dedicated to various Bi-based electrocatalysts, such as metallic Bi, [5] bismuth oxide, [6] bismuth sulfide, [7] bismuth phosphate, [8] bismuth subcarbonate (Bi 2 O 2 CO 3 , BOC), [9] and bismuth oxyhalides (BiOX, X = Cl, Br, I). Among them, BOC with [Bi 2 O 2 ] 2+ and [CO 3 ] 2− layered alternating stack structure own excellent performance for conversing the CO 2 to formate has attracted wide attention.…”