High Temperature Monolithic Biochar Supercapacitor Using Ionic Liquid Electrolyte

Junhua Jiang

Research output: Contribution to journalArticlepeer-review


A supercapacitor comprising of two binder-free biochar monolith electrodes and 1-butyl-3-methylimidazolium tetrafluoroborate based ionic liquid electrolyte was studied at room temperature and 140°C by cyclic voltammetry, constant-current charge-discharge, and electrochemical impedance spectroscopy. The supercapacitor exhibits an operating voltage window of approximately 6 V. It is found that increasing temperature from room temperature to 140°C considerably increases its specific mass capacity and its charge-discharge rate by a factor of approximately 10. The specific capacity of the supercapacitor calculated from the voltammetric measurements depended on scan rates. At 140°C, a capacity of 21 F g−1 was obtained at 5 mV s−1 and this value decreases to around 10 F g−1 at 100 mV s−1; the constant-current charge-discharge profiles exhibit pseudo-linear voltage-time responses during the discharges. The supercapacitor shows good stability characteristics of no obvious performance decay after 1000 cycles within a voltage window of 6 V. Electrochemical impedance spectra of the supercapacitor display a wide linear region corresponding to diffusion control. The energy densities of the supercapacitor that are normalized to the total active electrode materials are higher than 20 Wh kg−1 when its power density is lower than 2000 W kg−1. These facts suggest that the high-temperature biochar supercapacitor would be a promising energy-storage device with high energy and power density.
Original languageEnglish (US)
Pages (from-to)H5043-H5048
JournalJournal of the Electrochemical Society
Issue number8
StatePublished - 2017


  • ISTC

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Renewable Energy, Sustainability and the Environment


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