<i>In Situ</i> Bismuth Nanosheet Assembly for Highly Selective Electrocatalytic CO<sub>2</sub> Reduction to Formate
Chanjuan Peng, Xintao Wu, Guang Zeng, Qi‐Long Zhu
Abstract
Abstract The reduction of carbon dioxide (CO 2 ) into value‐added fuels using an electrochemical method has been regarded as a compelling sustainable energy conversion technology. However, high‐performance electrocatalysts for CO 2 reduction reaction (CO 2 RR) with high formate selectivity and good stability need to be improved. Earth‐abundant Bi has been demonstrated to be active for CO 2 RR to formate. Herein, we fabricated an extremely active and selective bismuth nanosheet (Bi‐NSs) assembly via an in situ electrochemical transformation of (BiO) 2 CO 3 nanostructures. The as‐prepared material exhibits high activity and selectivity for CO 2 RR to formate, with nearly 94% faradaic efficiency at −1.03 V (versus reversible hydrogen electrode (vs. RHE)) and stable selectivity (>90%) in a large potential window ranging from −0.83 to −1.18 V (vs. RHE) and excellent durability during 12 h continuous electrolysis. In addition, the Bi‐NSs based CO 2 RR/methanol oxidation reaction (CO 2 RR/MOR) electrolytic system for overall CO 2 splitting was constructed, evidencing the feasibility of its practical implementation.