Redox-Active Water-in-Salt Electrolyte for High-Energy-Density Supercapacitors

Jinwoo Park, Junyoung Lee, Woong Kim

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


In view of the need for environmental friendliness and cost effectiveness, the enhancement of the energy density of the aqueous supercapacitor is in high demand. Recently, concentrated aqueous electrolytes known as water-in-salt electrolytes (WiSEs) have attracted much attention due to their broad electrochemical stability window (2-3 V) relative to that of conventional dilute aqueous electrolytes (∼1 V). Meanwhile, the development of redox-active electrolytes has provided a great opportunity to improve the capacitance of the supercapacitors by providing an additional pseudocapacitive contribution. Herein, a supercapacitor containing a dual redox-active (RA) WiSE is demonstrated that combines the benefits of the wide voltage window of the WiSE and the high capacitance arising from the RA species, thus significantly amplifying the energy density of the supercapacitor. Moreover, the voltage plateau arising from the simultaneous redox reactions can deliver a constant power output, representing a distinctive and attractive alternative to the conventional aqueous supercapacitors.

Original languageEnglish
Pages (from-to)1266-1273
Number of pages8
JournalACS Energy Letters
Issue number4
Publication statusPublished - 2022 Apr 8

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF-2020R1A2C2008798).

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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