Scalable Chemical Interface Confinement Reduction BiOBr to Bismuth Porous Nanosheets for Electroreduction of Carbon Dioxide to Liquid Fuel

• Published in: Advanced functional materials 2022-03, Vol.32 (10), p.n/a
• Main Authors: Fu, Xianbiao, Wang, Jia‐ao, Hu, Xiaobing, He, Kun, Tu, Qing, Yue, Qin, Kang, Yijin
• Format: Article
• Language: English
• Subjects: 2D materials; BiOBr nanosheets; Bismuth; Carbon dioxide; chemical interface confinement reduction; Chemical reduction; CO 2 electroreduction; Confinement; Density functional theory; Electrocatalysts; Electrochemical analysis; Free energy; Fuel production; Grain boundaries; grain boundary; Liquid fuels; Materials science; Nanosheets; Selectivity
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202107182

Electrochemical reduction of carbon dioxide (CO2) toward chemical and fuel production is a compelling component of the new energy system. Two‐dimensional bismuth with a particular surface has been identified as a highly efficient electrocatalyst for converting CO2 to formate. However, the development of a controllable synthetic strategy for possible large‐scale production of such Bi materials remains highly challenging. Herein, a scalable chemical interface confinement reduction method is proposed for topotactic transformation of BiOBr (001) nanosheets to metallic Bi (001) porous nanosheets (PNS). As expected, the Bi (001) PNS exhibits excellent electrochemical performance on CO2 reduction to formate, with Faradaic efficiency of 95.2% and formate partial current density of 72 mA cm−2. Density functional theory calculations suggest that Bi PNS selectively exposes (001) surfaces with small‐angle grain boundaries can significantly lower the free energy barrier for the formation of *OCHO, which are responsible for the high activity and selectivity toward CO2‐to‐formate conversion. The chemical interface confinement reduction method is proposed to produce the model catalysts of Bi (001) nanosheets via topotactic transformation of BiOBr (001) nanosheets for CO2 electroreduction at a scalable large‐scale. The formate Faradaic efficiency of 95.2% is achieved on Bi (001) nanosheets due to the small‐angle grain boundaries that can significantly lower the free energy barrier for the formation of *OCHO.