Electrochemical Deposited Zeolitic Imidazolate Frameworks as an Efficient Electrocatalyst for CO2 Electrocatalytic Reduction

作者：Renjie Zhang, Jie Yang, Xinbo Zhao, Han Yang, Hongping Li, Bairun Ji, Guangying Zhou, Xiaoxue Ma, Dexin Yang · 发表于：ChemCatChem · 年份：2021 · DOI：10.1002/cctc.202101653 · 被引用次数：28 · 研究领域：CO2 Reduction Techniques and Catalysts、Ionic liquids properties and applications、Covalent Organic Framework Applications

Abstract Electrocatalytic reduction of CO 2 over zeolitic imidazolate frameworks (ZIFs) generally has poor activity and low CO Faradaic efficiency due to the poor contact between conductive substrate and ZIFs synthesized by ex‐situ method. Here, ZIF‐8 films on Zn foils (ZIF‐8/Zn) fabricated by in‐situ electrochemical deposition were used for CO 2 electroreduction in ionic liquid‐based ternary electrolyte. Tunable morphology and thickness of ZIF‐8 film can regulate the activity of CO 2 electroreduction. The ZIF‐8/Zn‐40 electrode demonstrates the highest CO Faradaic efficiency (91.8 %) with the current density of 12.6 mA cm −2 at −1.9 V vs . Ag/Ag + , which is superior to the performance of ZIF‐8/CP electrode prepared by ex‐situ method. The excellent activity of ZIF‐8/Zn‐40 electrode is mainly attributed to abundant active sites in 3D structures with largest surface area, tight and good contact between ZIF‐8 film and Zn foil, faster rate CO 2 diffusion, and synergistic effect between electrode and [Bmim]PF 6 ‐containing electrolyte. The facile synthesis of ZIF‐8/Zn electrode provides a novel technology to design efficient electrodes for CO 2 electroreduction.