KOH direct treatment of kombucha and in situ activation to prepare hierarchical porous carbon for high-performance supercapacitor electrodes
Changchao Dai, Jiafeng Wan, Weidan Geng, Shijiao Song, Fangwei MaEmail, Jinqiu Shao
Kombucha, a renewable biomass, has been successfully utilized as an accessible carbon source to fabricate kombucha-derived hierarchical porous carbon (KHPC) by KOH direct treatment and in situ activation. The prepared KHPC shows an interconnected hierarchical porous structure, a pore volume of 0.41 cm3 g1, and a specific surface area of 917 m2 g?1. Due to the multiple synergistic effects of these advantages, the KHPC-3 exhibits a high specific capacitance of 326 F g1 at a current density of 1 A g1 in 6 M KOH, good rate capability of 82% retention from 1 to 20 A g1, and cycling performance with 91.3% retention over 5000 cycles. Moreover, the KHPC-3 symmetric supercapacitor reveals a good energy density of 20.97 Wh kg1 at a power density of 871.2 W kg1 and retains 8.08 Wh kg1 at 6330 W kg?1 in 1 M Na2SO4 electrolyte. Therefore, the KHPC obtained via the simple synthesis process shows great promise as an electrode material in energy storage devices.
Keywords: porous carbon koh activation kombucha high performance supercapacitor
Citation: Solid State Electrochem (2017)
Study Mailing Address:
School of Chemistry and Material ScienceHeilongjiang UniversityHarbinChina
Date Updated: January 20, 2021