Design and Synthesis of 3D Potassium-Ion Pre-Intercalated Graphene for Supercapacitors

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Department of Materials Science and Engineering


In this paper, a novel material - 3D potassium-ion preintercalated graphene - was designed and synthesized via one step using a new reaction between K and CO. Furthermore, this material exhibited excellent performance as electrodes for aqueous symmetrical supercapacitors. When the electrode was scaled up from 3.0 to 8.0 mg/cm2, negligible capacitance degradation was observed, leading to a very high areal capacitance of 1.50 F/cm2 at 1 A/g. Furthermore, even if a large operating temperature of -15 or 55 °C was employed, its excellent electrochemical performance remained with specific capacitances of 208 F/g at 55 °C, 184 F/g at 25 °C, and 98 F/g at -15 °C. This could be attributed to 3D structure and K+ preintercalation of the material, which provides rich active sites for electric double-layer formation, lower ion transport resistance, and shorter diffusion distance.

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© 2018 American Chemical Society. Publisher’s version of record: https://doi.org/10.1021/acs.iecr.7b05413

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Industrial and Engineering Chemistry Research