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Improving The Symmetry Of Asymmetric Supercapacitors Using Battery-Type Positive Electrodes And Activated Carbon Negative Electrodes By Mass And Charge Balance

Krishnan, Syam G. and Harilal, Midhun and Pal, Bhupender and Izan Izwan, Misnon and Karuppaiah, Chelladurai and Yang, Chun-Chen and Rajan, Jose (2017) Improving The Symmetry Of Asymmetric Supercapacitors Using Battery-Type Positive Electrodes And Activated Carbon Negative Electrodes By Mass And Charge Balance. Journal of Electroanalytical Chemistry, 805. pp. 126-132. ISSN 1572-6657

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Abstract

Asymmetric supercapacitors (ASCs) are routinely fabricated using battery-type electrode materials as a positive electrode and electrochemical double layer materials as a negative electrode; the mass-loading in the electrodes is determined by assuming both to be capacitive charge storage materials. This protocol is erroneous as the cyclic voltammograms and galvanostatic charge-discharge curves of the resulting devices showed dissimilarity in the stored charges of the two electrodes and battery-type behaviors, respectively. Herein, we show by employing two choices of battery-type electrodes as positive electrodes and commercial activated carbon as negative electrode in 3 M LiOH electrolyte that equal mass loading in both electrodes leads to supercapacitive charge storage. The positive electrode to negative electrode mass ratio is varied from 0.75 to 1.5 in a mass interval of 0.25 which includes a mass ratio of the conventional method. The electrochemical studies of the fabricated ASCs show that the charge storage capabilities depend on the electrode mass. Electrochemical impedance spectroscopy studies show that the equal mass ratio has low series and charge transfer resistances and wider frequency dispersion of capacitance.

Item Type: Article
Uncontrolled Keywords: Asymmetric supercapacitors; Magnesium cobaltite; Manganese cobaltite; Charge storage
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Prof. Dr. Jose Rajan
Date Deposited: 06 Dec 2017 02:20
Last Modified: 26 Jul 2018 02:51
URI: http://umpir.ump.edu.my/id/eprint/19283
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