Wide Electrochemical Stability Window of NaClO4 Water-in-Salt Electrolyte Elevates the Supercapacitive Performance of Poly(3,4-ethylenedioxythiophene)

Plawan Kumar Jha*, Sachin Kochrekar, Ashwini Jadhav, Robert Lassfolk, Mikko Salomäki, Ermei Mäkilä, Carita Kvarnström*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Water-in-salt electrolytes (WiSEs) have emerged as the primary preference in the domain of aqueous-based supercapacitors, thanks to their wide electrochemical stability window (ESW > 1.23 V). Here, we have chemically synthesized a unique lettuce coral-like structure of tosylate doped-poly(3,4-ethylenedioxythiophene) (PEDOT-tos) and tested it for supercapacitor application in a 17 molal (m) NaClO 4 WiSE, achieving an ESW of 1.9 V. The energy and power densities (E d and P d) of our PEDOT-tos supercapacitor are as high as 14 Wh kg -1 and 7210 W kg -1, respectively, with over 80 % capacitance retention after 10,000 continuous Galvanostatic charge-discharge cycles. The NaClO 4 WiSE increases the E d and P d of PEDOT by several folds compared to traditional H 2SO 4 electrolyte. This work encourages the exploration of a suitable combination of a PEDOT-based composite material and WiSE for high-performance supercapacitors.

Original languageEnglish
Article number103758
Pages (from-to)103758
JournalEnergy Storage Materials
Volume72
DOIs
Publication statusPublished - Sept 2024
MoE publication typeA1 Journal article-refereed

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