Confining Iodine into Metal‐Organic Framework Derived Metal‐Nitrogen‐Carbon for Long‐Life Aqueous Zinc‐Iodine Batteries

Author:

Guo Xiaotian1,Xu Hengyue2,Tang Yijian1,Yang Zhangbin1,Dou Fei1,Li Wenting1,Li Qing3,Pang Huan1ORCID

Affiliation:

1. School of Chemistry and Chemical Engineering Yangzhou University Yangzhou Jiangsu 225009 P. R. China

2. Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 P. R. China

3. Guangling College Yangzhou University Yangzhou Jiangsu 225009 P. R. China

Abstract

AbstractAqueous zinc–iodine batteries (AZIBs) are highly appealing for energy requirements owing to their safety, cost‐effectiveness, and scalability. However, the inadequate redox kinetics and severe shuttling effect of polyiodide ions impede their commercial viability. Herein, several Zn‐MOF‐derived porous carbon materials are designed, and the further preparation of iron–doped porous carbon (Fe–N–C, M9) with varied Fe doping contents is optimized based on a facile self‐assembly/carbonization approach. M9, with atomic Fe coordinated to nitrogen atoms, is employed as an efficient cathode host for AZIBs. Functional modifications of porous carbon hosts involving the doping species and levels are investigated. The adsorption tests, in situ Raman spectroscopy, and in situ UV–vis results demonstrate the adsorption capability and charge‐discharge mechanism for the iodine species. Furthermore, experimental findings and theoretical analyses have proven that the redox conversion of iodine is enhanced through a physicochemical confinement effect. This study offers basic principles for the strategic design of single‐atom dispersed carbon as an iodine host for high‐performance AZIBs. Flexible soft–pack battery and wearable microbattery applications also have implications for future long‐life aqueous battery designs.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

China Postdoctoral Science Foundation

Publisher

Wiley

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