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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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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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