期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 35, 页码 12065-12069出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201905713
关键词
covalent organic frameworks; energy storage; free-standing films; micro-supercapacitors
资金
- Shanghai Committee of Science and Technology [16JC1400703]
- National Natural Science Foundation of China [21720102002, 21774072, 21574080]
- Open Project Program of the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry (Jilin University) [2019-01]
Developing effective synthetic strategies as well as enriching functionalities for sp(2)-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 pi-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.
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