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An Artificial Interface for High Cell Voltage Aqueous-Based Electrochemical Capacitors

Abstract : Aqueous electrolytes are very effective for supercapacitor applications but their narrow electrochemical potential window (∼1 V) and associated limited energy currently limits their use. Here, we demonstrate a new strategy to enlarge the potential window by designing an artificial interface (ai). An effective ai was achieved via a mixture of siloxanes doped with an ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI TFSI). Indeed, the as-deposited ai on the carbon-based electrode hinders the electron charge transfer but not the ionic charge transfer, making the ai ionic conductive. As a result, a cell voltage of about 1.8 V was obtained in aqueous electrolyte-EMI HSO4 1 mol l−1 in water. Used as a membrane, the ai was found to be ionically specific to EMI+; the proton transference number being close to zero. These results show the strategy of developing an ai at the electrode/electrolyte interface could represent a new path for aqueous-based carbon-carbon supercapacitors to reach higher cell voltages, providing both higher specific energy and power.
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https://hal.archives-ouvertes.fr/hal-03371278
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Submitted on : Friday, October 8, 2021 - 2:48:38 PM
Last modification on : Wednesday, November 17, 2021 - 12:32:46 PM

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Marco Olarte, Marie-Joëlle Menu, Patrice Simon, Marie Gressier, Pierre-Louis Taberna. An Artificial Interface for High Cell Voltage Aqueous-Based Electrochemical Capacitors. Journal of The Electrochemical Society, Electrochemical Society, 2021, 168 (7), pp.070520. ⟨10.1149/1945-7111/ac10f5⟩. ⟨hal-03371278⟩

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