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A 2.7 V Aqueous Supercapacitor Using a Microemulsion Electrolyte **
Author(s) -
Hughson Fraser R.,
Borah Rohan,
Nann Thomas
Publication year - 2021
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000314
Subject(s) - supercapacitor , electrolyte , microemulsion , capacitance , aqueous solution , faraday efficiency , materials science , energy storage , chemical engineering , voltage , chemistry , electrode , electrical engineering , pulmonary surfactant , physics , organic chemistry , engineering , quantum mechanics , power (physics)
The use of aqueous electrolytes in energy storage devices is traditionally limited by the voltage stability window of water at 1.23 V. Here, we present the use of a microemulsion based electrolyte which, although mostly water by mass, has a voltage stability window of up to 5 V. This allows the cost and safety benefits of aqueous electrolytes to finally be realised in high voltage systems. Supercapacitors constructed using this electrolyte were able to achieve and maintain a capacitance of ∼40 Fg −1 and an energy density of ∼40 Wh kg −1 with a Coulombic efficiency of 99 % for over 10,000 cycles on activated carbon.