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Capacitance Optimization of Planar Carbon-based Supercapacitor


Paper Type 
 Contributed Paper
Title 
 Capacitance Optimization of Planar Carbon-based Supercapacitor
Author 
 Ukrit Jitropas, Chumphol Yunphuttha, Sumeth Siriroj and Worawat Meevasana*
Email 
 worawat@g.sut.ac.th
Abstract:
By offering high power density and a long cycle life, electrochemical double-layer capacitor
(EDLC) or ‘supercapacitor’ becomes a great candidate for energy storage device. Supercapacitors store
charge through the electric field at the interface between porous electrode and electrolyte. Activated
carbon and other carbon-based materials are typically used as electrode due to its high surface area. On
the other hand, dimension of the electrode is also a crucial parameter regardless of material characteristic.
Here, six electrode architectures with different array ratio (active area: gap space) were studied. The
focus is to design electrode arrangement of planar supercapacitor to enhance its performance beyond a
conventional sandwich structure. All cells were fabricated with the same procedures where each side of
a copper foil was coated with carbon-based material and a separator soaked with 3M aqueous sodium
nitrate was used as electrolyte. In case of low charging current of 5mA, all planar designs provide a
higher specific capacitance than the conventional sandwich supercapacitor. Maximum yielded is 23.3 F/g
(array ratio of 4:1) which is around 30% enhancement from that of conventional design (17.9 F/g) at
0.8V. Upon increasing the charging current, the specific capacitance of the cells with large gap space
decreases dramatically while the cells with narrow gap space still provide a good performance relative
to the conventional structure. This behavior indicates how electrode arrangement plays an important
role on ions movement. Optimization of electrode pattern will give an opportunity for enhancing the
capacitance of planar supercapacitor for real application of energy storage device.
Start & End Page 
 607 - 613
Received Date 
 2019-07-26
Revised Date 
Accepted Date 
 2020-01-09
Full Text 
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Keyword 
 electrochemical double-layer capacitor, supercapacitor, energy storage, optimization
Volume 
 Vol.47 No.4 (Special Issue II : July 2020)
DOI 
Citation 
 Jitropas U., Yunphuttha C., Siriroj S. and Meevasana W., Capacitance Optimization of Planar Carbon-based Supercapacitor, Chiang Mai J. Sci., 2020; 47(4): 607-613.
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Chiang Mai Journal of Science

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