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A promising water-in-salt electrolyte for aqueous based electrochemical energy storage cells with a wide potential window: highly concentrated HCOOK

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Abstract

Recently, water-in-salt electrolytes have been widely reported because of their ability in broadening the potential window of aqueous based energy storage devices. Herein, another eco-friendly and cost-effective electrolyte, concentrated potassium formate of 40 M HCOOK where the water-to-salt molar ratio falls to 1.38 : 1, is proposed. The electrolyte demonstrates a wide potential window of up to 4 V (−2.5 to 1.5 V vs. Ag/AgCl) with a glassy carbon electrode. Compared with a CH3COOK based electrolyte, the HCOOK possesses lower stable negative potential and higher ionic conductivity. For an activated carbon based supecapacitive electrode, a low discharge potential of −2.4 V vs. Ag/AgCl can be achieved. Besides, a high capacity of 321 F g−1 is obtained at 5 A g−1 and it is still as high as 121 F g−1 at 20 A g−1. Meanwhile, typical K-battery behavior is exhibited for the KTi2(PO4)3 anode and a reversible capacity of 15 mA h g−1 can be delivered at 0.1 A g−1.

Graphical abstract: A promising water-in-salt electrolyte for aqueous based electrochemical energy storage cells with a wide potential window: highly concentrated HCOOK

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Publication details

The article was received on 30 Jul 2019, accepted on 30 Sep 2019 and first published on 01 Oct 2019


Article type: Communication
DOI: 10.1039/C9CC05927J
Chem. Commun., 2019, Advance Article

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    A promising water-in-salt electrolyte for aqueous based electrochemical energy storage cells with a wide potential window: highly concentrated HCOOK

    T. Liu, L. Tang, H. Luo, S. Cheng and M. Liu, Chem. Commun., 2019, Advance Article , DOI: 10.1039/C9CC05927J

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