A High-Performance Symmetric Supercapacitor from Porous Activated Carbon under Compression

Wei Sun, Yulin Zhang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The realization of biomass-derived supercapacitors of high performance is of practical importance for the manufacturing of supercapacitors from green and renewable sources. Herein, the feasibility of constructing high-performance supercapacitors from potato-derived activated carbon (AC) is demonstrated. The potato-derived AC is produced from potato mash through hydrothermal treatment and high-temperature activation with KOH as agent. The supercapacitors with aqueous electrolyte of 6 m KOH and a mass loading of 5 mg per electrode achieve a specific gravimetric capacitance of 333.7 F g−1 per electrode and a specific energy of 11.75 W h g−1 at a specific power of 197.6 W kg−1 at a current density of 0.4 A g−1 under a nominal compressive stress of 7.96 MPa. The supercapacitors with a mass loading of 10 mg per electrode achieve the maximum specific gravimetric capacitance of 340.6 F g−1 and a specific energy of 11.75 W h g−1 at a specific power of 194.2 W kg−1 at a current density of 0.4 A g−1 under a nominal compressive stress of 7.96 MPa. Increasing the compaction of electrode materials under compressive stress has the potential to increase the electrochemical performance of supercapacitors.

Original languageEnglish
Article number2100068
JournalEnergy Technology
Volume9
Issue number5
DOIs
StatePublished - May 2021

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Keywords

  • IR drop
  • compressive stress
  • energy density
  • power density
  • specific capacitance
  • supercapacitors

ASJC Scopus subject areas

  • General Energy

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