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

Authors
Park, JinwooLee, JunyoungKim, Woong
Issue Date
8-4월-2022
Publisher
AMER CHEMICAL SOC
Citation
ACS ENERGY LETTERS, v.7, no.4, pp.1266 - 1273
Indexed
SCIE
SCOPUS
Journal Title
ACS ENERGY LETTERS
Volume
7
Number
4
Start Page
1266
End Page
1273
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141797
DOI
10.1021/acsenergylett.2c00015
ISSN
2380-8195
Abstract
In view of the need for environmental friend-liness and cost effectiveness, the enhancement of the energydensity of the aqueous supercapacitor is in high demand.Recently, concentrated aqueous electrolytes known as water-in-salt electrolytes (WiSEs) have attracted much attention due totheir broad electrochemical stability window (2-3 V) relative tothat of conventional dilute aqueous electrolytes (similar to 1V).Meanwhile, the development of redox-active electrolytes hasprovided a great opportunity to improve the capacitance of thesupercapacitors by providing an additional pseudocapacitivecontribution. 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 highcapacitance arising from the RA species, thus significantly amplifying the energy density of the supercapacitor. Moreover, thevoltage plateau arising from the simultaneous redox reactions can deliver a constant power output, representing a distinctiveand attractive alternative to the conventional aqueous supercapacitors.
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