An Olefin-Linked Covalent Organic Framework as a Flexible Thin-Film Electrode for a High-Performance Micro-Supercapacitor
An Olefin-Linked Covalent Organic Framework as a Flexible Thin-Film Electrode for a High-Performance Micro-Supercapacitor
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烯烃连接的共价有机框架作为高性能微型超级电容器的柔性薄膜电极
DOI：
10.1002/anie.201905713
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Zhang Fan
中科院分区：
文献类型：
--
作者：
Xu Junsong;He Yafei;Bi Shuai;Wang Mao;Yang Peng;Wu Dongqing;Wang Jianjian;Zhang Fan
开发有效的合成策略以及丰富sp2-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缩合的变体，合成了一种新的由未取代的C=C键连接的完全共轭的COF（g-C34 N6-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骨架中导致增强的π电子通信和电化学活性。该COF显示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COF基MSC显示出高达15.2 mF cm−2的面积电容，高达7.3 mWh cm−3的高能量密度，以及卓越的倍率性能。 这些值是最先进MSC的最高值。此外，该器件具有良好的灵活性和集成能力。
Developing effective synthetic strategies as well as enriching functionalities for sp2‐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‐C34N6‐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−2, a high energy density of up to 7.3 mWh cm−3, 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.