Wide electrochemical stability window of NaClO4 water-in-salt electrolyte elevates the supercapacitive performance of poly(3,4-ethylenedioxythiophene)
: Jha, Plawan Kumar; Kochrekar, Sachin; Jadhav, Ashwini; Lassfolk, Robert; Salomäki, Mikko; Mäkilä, Ermei; Kvarnström, Carita
Publisher: Elsevier BV
: AMSTERDAM
: 2024
: Energy storage materials
: Energy Storage Materials
: ENERGY STORAGE MATER
: 103758
: 72
: 10
: 2405-8297
: 2405-8289
DOI: https://doi.org/10.1016/j.ensm.2024.103758
: http://dx.doi.org/10.1016/j.ensm.2024.103758
: https://research.utu.fi/converis/portal/detail/Publication/458381301
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) NaClO4 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 NaClO4 WiSE increases the E-d and P-d of PEDOT by several folds compared to traditional H2SO4 electrolyte. This work encourages the exploration of a suitable combination of a PEDOT-based composite material and WiSE for high-performance supercapacitors.
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P.K.J., S.K., and A.J. acknowledge the Real Estate Foundation, Finland, and Business Finland (COMPOL project) for their financial support. P.K.J. and R.L. are grateful to the Turku Center for Chemical and Molecular Analytics (CCMA) for providing the NMR facility. P.K.J. thanks Pooja Sindhu from IISER Pune for the TEM images. P.K.J. thanks Pia Damlin from university of Turku for the technical help.
