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Updated: Apr 14, 2026
Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Holey graphene nanosheets with surface functional groups as high-performance supercapacitors in ionic-liquid
Cheng-Hsien Yang1, Po-Ling Huang1, Xu-Feng Luo1
1Institute of Materials Science and Engineering, National Central University, 300 Jhong-Da Road, Taoyuan (Taiwan), Fax: (+886) 3-2805034.
Porous graphene nanosheets (GNSs) with functional groups enhance supercapacitor performance in a butylmethylpyrrolidinium-dicyanamide (BMP-DCA) ionic liquid (IL) electrolyte. This GNS electrode achieves high capacitance and energy density, outperforming carbon nanotubes and activated carbon.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Supercapacitors require advanced electrode materials for improved energy and power density.
- Graphene nanosheets (GNSs) offer high surface area but often need surface modification for optimal electrochemical performance.
- Ionic liquid (IL) electrolytes, such as butylmethylpyrrolidinium-dicyanamide (BMP-DCA), present advantages in terms of electrochemical stability and operating temperature range.
Purpose of the Study:
- To enhance supercapacitor performance by creating pores and surface functional groups on graphene nanosheets (GNSs).
- To evaluate the electrochemical properties of modified GNSs in a BMP-DCA ionic liquid electrolyte.
- To investigate the effect of temperature on the performance of GNS-based supercapacitors.
Main Methods:
- Graphene nanosheets (GNSs) were functionalized and their porous structure was engineered.
- Electrochemical performance was tested using cyclic voltammetry and galvanostatic charge-discharge.
- X-ray photoelectron spectroscopy (XPS) was employed to confirm pseudocapacitive effects.
- Supercapacitor cells were assembled using GNS electrodes and BMP-DCA IL electrolyte, with comparative studies against carbon nanotube and activated carbon electrodes, and a control cell with organic electrolyte.
Main Results:
- The modified GNS electrode achieved an optimal capacitance of 330 F/g and a wide potential window of 3.3 V at 25°C.
- Pseudocapacitive effects were confirmed via XPS analysis.
- At 60°C, the GNS supercapacitor with IL electrolyte delivered significantly higher energy (140 Wh/kg) and power densities (52.5 kW/kg) compared to a control cell with organic electrolyte (20 Wh/kg and 17.8 kW/kg).
- Increasing temperature improved IL conductivity and decreased viscosity, further enhancing cell performance.
Conclusions:
- Surface modification and pore creation on GNSs effectively improve supercapacitor performance.
- The GNS/BMP-DCA IL system demonstrates superior energy and power densities, especially at elevated temperatures, compared to conventional supercapacitor configurations.
- This research highlights the potential of functionalized GNSs in IL electrolytes for next-generation high-performance energy storage devices.
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