Oxygen vacancy stabilized <scp>Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub></scp> nanosheet for <scp>CO<sub>2</sub></scp> electroreduction at low overpotential enables energy efficient CO‐production of formate
Yangyang Zhang, Yanxu Chen, Rong Liu, Xiaowen Wang, Huanhuan Liu, Yin Zhu, Qizhu Qian, Yafei Feng, Mingyu Cheng, Genqiang Zhang
Abstract
Abstract Bismuth‐based electrocatalysts are promising candidates for electrochemical CO 2 reduction to formate attributing to the accelerated formation of *OCHO intermediate, while the high‐energy consumption remains a major challenge for practicability. Herein, we present the ultrathin Bi 2 O 2 CO 3 nanosheets with abundant oxygen vacancy ( Vo ‐BOC‐NS) reconstructed from S, N‐co‐doped bismuth oxides that can act as durable electrocatalyst for CO 2 ‐to‐formate conversion with faradic efficiency (FE formate ) of >95%, partial current density of 286 mA cm −2 with energy efficiency of 73.8% at −0.62 V (vs. RHE) and low overpotential of 200 mV in a flow electrolyzer. The theoretical calculations decipher that the oxygen vacancy can optimize *OCOH adsorption/desorption for the accelerated conversion kinetics. The pair‐electrosynthesis tactic of formate co‐production can enable a superior FE formate of >90% at wide cell voltage of 2–3.3 V and total yield rate of 3742 μmol cm −2 h −1 at 3.3 V, suggesting great potential for future industrialization. image