An Electrochemically Stable 2D Covalent Organic Framework for High-performance Organic Supercapacitors

• Published in: Chinese journal of polymer science 2020-05, Vol.38 (5), p.558-564
• Main Authors: Iqbal, Rashid, Badshah, Amir, Ma, Ying-Jie, Zhi, Lin-Jie
• Format: Article
• Language: English
• Subjects: Capacitance; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Dimensional stability; Electrode materials; Electrodes; Flux density; Industrial Chemistry/Chemical Engineering; Macrostructure; Polymer Sciences; Supercapacitors
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-020-2412-z

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 × 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.