Xu Junsong, He Yafei, Bi Shuai, Wang Mao, Yang Peng, Wu Dongqing, Wang Jianjian, Zhang Fan
School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstr. 400, 01328, Dresden, Germany.
Angew Chem Int Ed Engl. 2019 Aug 26;58(35):12065-12069. doi: 10.1002/anie.201905713. Epub 2019 Jul 24.
Developing effective synthetic strategies as well as enriching functionalities for sp -carbon-linked covalent organic frameworks (COFs) still remains a challenge. Now, taking advantage of a variant of Knoevenagel condensation, a new fully conjugated COF (g-C N -COF) linked by unsubstituted C=C bonds was synthesized. Integrating 3,5-dicyano-2,4,6-trimethylpyridine and 1,3,5-triazine units into the molecular framework leads to the enhanced π-electron communication and electrochemical activity. This COF shows uniform nanofibrous morphology. By assembling it with carbon nanotubes, a flexible thin-film electrode for a micro-supercapacitor (MSC) can be easily obtained. The resultant COF-based MSC shows an areal capacitance of up to 15.2 mF cm , a high energy density of up to 7.3 mWh cm , and remarkable rate capability. These values are among the highest for state-of-the-art MSCs. Moreover, this device exhibits excellent flexibility and integration capability.
开发有效的合成策略以及丰富sp-碳连接的共价有机框架（COF）的功能仍然是一个挑战。现在，利用Knoevenagel缩合的一种变体，合成了一种由未取代的C=C键连接的新型全共轭COF（g-CN-COF）。将3,5-二氰基-2,4,6-三甲基吡啶和1,3,5-三嗪单元整合到分子框架中可增强π电子通信和电化学活性。这种COF呈现出均匀的纳米纤维形态。通过将其与碳纳米管组装，可以轻松获得用于微型超级电容器（MSC）的柔性薄膜电极。所得的基于COF的MSC表现出高达15.2 mF cm的面积电容、高达7.3 mWh cm的高能量密度以及出色的倍率性能。这些值在最先进的MSC中名列前茅。此外，该器件还具有出色的柔韧性和集成能力。
