Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki 444-8787 (Japan).
Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275 (P. R. China).
Angew Chem Int Ed Engl. 2015 Jun 1;54(23):6814-8. doi: 10.1002/anie.201501706. Epub 2015 Apr 23.
Ordered π-columns and open nanochannels found in covalent organic frameworks (COFs) could render them able to store electric energy. However, the synthetic difficulty in achieving redox-active skeletons has thus far restricted their potential for energy storage. A general strategy is presented for converting a conventional COF into an outstanding platform for energy storage through post-synthetic functionalization with organic radicals. The radical frameworks with openly accessible polyradicals immobilized on the pore walls undergo rapid and reversible redox reactions, leading to capacitive energy storage with high capacitance, high-rate kinetics, and robust cycle stability. The results suggest that channel-wall functional engineering with redox-active species will be a facile and versatile strategy to explore COFs for energy storage.
有序π柱和共价有机框架（COFs）中的开口纳米通道可以使它们能够存储电能。然而，实现氧化还原活性骨架的合成难度迄今为止限制了它们在储能方面的潜力。本文提出了一种通过后合成功能化将传统 COF 转化为储能优异平台的通用策略。带有固定在孔壁上的开放多自由基的自由基框架经历快速和可逆的氧化还原反应，从而实现具有高电容、高倍率动力学和稳健循环稳定性的电容储能。研究结果表明，用氧化还原活性物质对通道壁进行功能化工程是探索 COFs 用于储能的一种简单而通用的策略。
