期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 38, 期 5, 页码 558-564出版社
SPRINGER
DOI: 10.1007/s10118-020-2412-z
关键词
2D COFs; Electrochemically stable; Electrode materials; High energy density; Organic supercapacitors
资金
- Ministry of Science and Technology of China [2012CB933403]
- Beijing Natural Science Foundation [2182086]
- National Natural Science Foundation of China [51425302, 51302045]
- CAS-TWAS President's PhD Fellowship program
- Beijing Municipal Science and Technology Commission [Z121100006812003]
- Chinese Academy of Sciences
An electrochemically stable two-dimensional covalent organic framework, PI-COF, has been synthesized by a scalable solvothermal method. PI-COF possesses a highly crystalline structure, well-defined pores, high specific surface area, and cluster macrostructure. Thanks to these features, PI-COF can work as electrode materials in organic supercapacitors, exhibiting a specific capacitance of 163 F/g at 0.5 A/g over a wide potential window of 0-2.5 V. Moreover, PI-COF shows excellent rate performance, which can deliver 96 F/g even at a high current density of 40 A/g. Because of the high capacitance and wide potential window, PI-COF has achieved a superior energy density of 35.7 W center dot h/kg at a power density of 250 W/kg. Most importantly, due to the remarkable electrochemical stability, the PI-COF based device shows outstanding cycling stability with 84.1% capacitance maintained (137 F/g) after 3.0 x 10(4) charged/discharged cycles at 1 A/g. This work should shed light on designing new COF-based electrode materials for supercapacitors and other electrochemical devices.
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