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Updated: Sep 20, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Covalent Organic Frameworks Coupled with Redox Center and Adsorption Site for Efficient Shuttle-Free Zn-Iodine
Jing-Dong Feng1, Wang-Kang Han1, Jun-Jun He1
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P.R. China.
Abstract:
Aqueous zinc-iodine (Zn-I2) batteries exhibit significant potential for next-generation energy storage system, but the polyiodide shuttle effect severely impairs their performance and stability. Herein, a series of woven covalent organic frameworks (COFs), namely COF-RuNCS-X (X = 1-6), with pre-designed ruthenium(II) redox center and sulfur adsorption sites were constructed for shuttle-free cathode material in Zn-I2 batteries. The porous COF-RuNCS-X with abundant sulfur adsorption sites showed a selective adsorption of I3 - species for effectively mitigating the shuttle effect. Meanwhile, the incorporation of ruthenium(II) center into the COFs skeleton enhanced the redox kinetics of iodine species. Remarkably, COF-RuNCS-6 featuring the large pore size and high degree of conjugation demonstrated a discharge specific capacity as high as 395.8 mAh g-1 in Zn-I2 batteries and exhibited cycle stability up to 5000 cycles. This work provides a new understanding of the design of COF-based materials as efficient shuttle-free cathode materials for Zn-I2 batteries.
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