An Olefin‐Linked Covalent Organic Framework as a Flexible Thin‐Film Electrode for a High‐Performance Micro‐Supercapacitor
| Autor: | Dongqing Wu, Jianjian Wang, Fan Zhang, Yafei He, Peng Yang, Mao Wang, Shuai Bi, Junsong Xu |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Olefin fiber Materials science 010405 organic chemistry General Medicine General Chemistry Carbon nanotube Conjugated system 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences law.invention Chemical engineering Covalent bond law Electrode Knoevenagel condensation Covalent organic framework |
| Zdroj: | Angewandte Chemie International Edition. 58:12065-12069 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201905713 |
| Popis: | 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-C34 N6 -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. |
| Databáze: | OpenAIRE |
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