Bi‐Based Metal‐Organic Framework Derived Leafy Bismuth Nanosheets for Carbon Dioxide Electroreduction
Jian Yang, Xiaolin Wang, Yunteng Qu, Xin Wang, Hang Huo, Qikui Fan, Jin Wang, Li‐Ming Yang, Yuen Wu
Abstract
Abstract Electroreduction of carbon dioxide (CO 2 ) into high‐value and readily collectable liquid products is vital but remains a substantial challenge due to the lack of highly efficient and robust electrocatalysts. Herein, Bi‐based metal‐organic framework (CAU‐17) derived leafy bismuth nanosheets with a hybrid Bi/BiO interface (Bi NSs) is developed, which enables CO 2 reduction to formic acid (HCOOH) with high activity, selectivity, and stability. Specially, the flow cell configuration is employed to eliminate the diffusion effect of CO 2 molecules and simultaneously achieve considerable current density (200 mA cm −2 ) for industrial application. The faradaic efficiency for transforming CO 2 to HCOOH can achieve over 85 or 90% in 1 m KHCO 3 or KOH for at least 10 h despite a current density that exceeds 200 mA cm −2 , outperforming most of the reported CO 2 electroreduction catalysts. The hybrid Bi/BiO surface of leafy bismuth nanosheets boosts the adsorption of CO 2 and protects the surface structure of the as‐prepared leafy bismuth nanosheets, which benefits its activity and stability for CO 2 electroreduction. This work shows that modifying electrocatalysts by surface oxygen groups is a promising pathway to regulate the activity and stability for selective CO 2 reduction to HCOOH.