Abstract
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·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 × 104 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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Acknowledgments
This work was financially supported by the Ministry of Science and Technology of China (No. 2012CB933403), Beijing Natural Science Foundation (No. 2182086), the National Natural Science Foundation of China (Nos. 51425302 and 51302045), CAS-TWAS President's PhD Fellowship program, the Beijing Municipal Science and Technology Commission (No. Z121100006812003), and the Chinese Academy of Sciences.
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Iqbal, R., Badshah, A., Ma, YJ. et al. An Electrochemically Stable 2D Covalent Organic Framework for High-performance Organic Supercapacitors. Chin J Polym Sci 38, 558–564 (2020). https://doi.org/10.1007/s10118-020-2412-z
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DOI: https://doi.org/10.1007/s10118-020-2412-z