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https://doi.org/10.3938/NPSM.69.154
Effects of Aqueous Electrolytes in Supercapacitors
New Phys.: Sae Mulli 2019; 69: 154~158
Published online February 28, 2019;  https://doi.org/10.3938/NPSM.69.154
© 2019 New Physics: Sae Mulli.

Olaniyan IBUKUN, Hae Kyung JEONG*

Department of Physics, Institute of Basic Science, Daegu University, Gyeongsan 38453, Korea and

Department of Materials-Energy Science and Engineering, Institute of Industry and Technique, Daegu University, Gyeongsan 38453, Korea

Correspondence to: outron@gmail.com
Received November 16, 2018; Revised January 7, 2019; Accepted January 9, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
An activated carbon-carbon nanotube (AC-CNT) composite is synthesized by using a simple chemical process, and its electrochemical performance in different aqueous electrolytes, such as H$_2$SO$_4$, Na$_2$SO$_4$, and KOH, is investigated. The composite exhibits different capacitive behaviors in different aqueous electrolytes, demonstrating the highest specific capacitance (205 Fg$^{-1}$) in the H$_2$SO$_4$ electrolyte due to its having the highest molar ionic conductivity compared to the other two. Nyquist and Bode plots prove that the composite in the H$_2$SO$_4$ electrolyte has the lowest electrochemical impedance and highest capacitive behaviors compared to the others. The composite in the Na$_2$SO$_4$ electrolyte has the lowest capacitance due to the low molar ionic conductivity of the electrolyte, although it displays the best capacitance retention after 200 cycles. Selection of electrolytes, therefore, is an important factor for supercapacitor applications.
PACS numbers: 82.45.Gj, 81.05.uj, 88.30.rh
Keywords: Electrolyte, Carbon composite, Carbon nanotube


April 2019, 69 (4)
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