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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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High-Performance Three-Dimensional Mesoporous Graphene Electrode for Supercapacitors using Lyophilization and Plasma

Gyeongseop Lee¹, Choonghyeon Lee¹, Chang-Min Yoon¹

¹School of Chemical and Biological Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.

ACS Applied Materials & Interfaces

|January 25, 2017

Summary

Researchers developed a 3D mesoporous plasma-reduced graphene oxide web (mPrGO web) using lyophilization and plasma reduction. This novel material exhibits high conductivity and surface area, showing promise for advanced supercapacitor applications.

Keywords:

graphene lyophilization mesoporous plasma supercapacitor three-dimensional

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Area of Science:

Materials Science
Nanotechnology
Electrochemistry

Background:

Graphene oxide (GO) is a promising material for energy storage but requires effective reduction methods.
Developing 3D porous structures enhances surface area and ion transport for better electrochemical performance.
Plasma reduction offers a rapid and efficient method for GO reduction.

Purpose of the Study:

To fabricate a 3D mesoporous plasma-reduced graphene oxide web (mPrGO web).
To investigate the effects of plasma reduction parameters on GO reduction.
To evaluate the electrochemical performance of the mPrGO web for supercapacitor applications.

Main Methods:

Fabrication of a 3D graphene oxide web (GO web) via lyophilization.
Short-duration plasma treatment (<2 s) for GO reduction to mPrGO web.
Characterization of material properties including surface area, conductivity, and electrochemical performance.

Main Results:

Successful synthesis of a 3D mPrGO web with a unique crack-like mesoporous structure.
Optimized plasma power yielded high reduction degree and robust graphitic characteristics.
Achieved high electrical conductivity (87 S cm⁻¹) and surface area (642 m² g⁻¹).
Demonstrated outstanding specific capacitance (253.8 F g⁻¹ at 0.2 A g⁻¹) and excellent rate capability (76% retention at 5 A g⁻¹).

Conclusions:

The synergistic combination of lyophilization and plasma reduction effectively produces high-performance mPrGO web.
The mPrGO web exhibits excellent electrochemical properties, making it a suitable candidate for supercapacitor electrodes.
The developed fabrication method offers a scalable approach for producing advanced graphene-based energy storage materials.