Cobalt Single‐Atom Electrocatalysts Enhanced by Hydrogen‐Bonded Organic Frameworks for Long‐Lasting Zinc‐Iodine Batteries

作者：Chaofei Guo, Yingnan Cao, Yun Gao, Chuanwei Zhi, Yu‐Xuan Wang, Yuhan Luo, Xuejuan Yang, Xi‐Ping Luo · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202314189 · 被引用次数：97 · 研究领域：Advanced battery technologies research、Covalent Organic Framework Applications、Perovskite Materials and Applications

Abstract Herein, a hydrogen‐bonded cobalt porphyrin framework is presented that can efficiently host iodine and serve as an electrocatalyst for aqueous zinc‐iodine (Zn‐I 2 ) organic batteries. The Fourier Transform infrared spectroscopy (FT‐IR), X‐ray Photoelectron Spectroscopy (XPS), and Density functional theory (DFT) results demonstrate that hydrogen‐bonded organic frameworks (HOFs) possess excellent adsorption properties for iodine species. In situ Raman spectroscopy illustrates that the redox mechanism of Zn‐I 2 battery depends on the redox reaction of I/I − , with I 3 − /I 5 − serving as intermediary products. The in situ Ultraviolet‐visible (UV–vis) spectroscopy further reveals that HOFs restrict polyiodide solubilization. The aqueous Zn‐I 2 organic batteries with I 2 @PFC‐72‐Co cathodes exhibit excellent rate capability, achieving 134.9 mAh g −1 at 20 C. Additionally, these batteries demonstrate long‐term cycle stability, enduring > 5000 cycles at 20 C. The impressive electrochemical performance of I 2 @PFC‐72‐Co can be attributed to the cooperative Co single‐atom (CoSA) electrocatalyst in the HOF‐Co structure. Moreover, the benzene ring structure and the carboxyl functional group of HOFs possess a strong ability to adsorb iodine and iodide. Owing to these synergistic effects, the aqueous Zn‐I 2 batteries with the I 2 @PFC‐72‐Co cathode exhibit excellent electrochemical performance.