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Open AccessArticle

Ion-Liquid Based Supercapacitors with Inner Gate Diode-Like Separators

Electrical and Computer Engineering and Electronic Imaging Center, New Jersey Institute of Technology, Newark, NJ 07102, USA
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ChemEngineering 2019, 3(2), 39; https://doi.org/10.3390/chemengineering3020039
Received: 11 March 2019 / Revised: 6 April 2019 / Accepted: 9 April 2019 / Published: 14 April 2019
(This article belongs to the Special Issue Advanced Functional Low-dimensional Materials and Their Applications)
In order to minimize unintentional discharge, supercapacitors are interfaced with a membrane that separates the anode from the cathode—this membrane is called the separator. We focus here on separators, which are structured as electronic diode-like. We call an electrically structured separator “the gate”. Through experiments, it was demonstrated that ionic liquid-filled supercapacitors, which were interfaced with gated separators exhibited a substantial capacitance (C) increase and reduction in the equivalent series resistance (ESR) compared to cells with ordinary separators. These two attributes help to increase the energy, which is stored in a cell, since for a given cell’s voltage, the dissipated energy on the cell, UR = V2/4(ESR) and the stored energy, UC = CV2/2, would increase. These were indeed ionic diodes since the order of the diode layout mattered—the diode-like structures exhibited maximum capacitance when their p-side faced the auxiliary electrode. View Full-Text
Keywords: supercapacitors; gated supercapacitors; energy storage elements; diode-like separators supercapacitors; gated supercapacitors; energy storage elements; diode-like separators
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Chowdhury, T.S.; Grebel, H. Ion-Liquid Based Supercapacitors with Inner Gate Diode-Like Separators. ChemEngineering 2019, 3, 39.

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