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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Restacking-inhibited 3D reduced graphene oxide for high performance supercapacitor electrodes.
Ji Hoon Lee1, Nokyoung Park, Byung Gon Kim
1Graduate School of EEWS (WCU), Korea Advanced Institute of Science and Technology (KAIST) , 291 Daehak-ro, Yuseong Gu, Daejeon 305-701, Republic of Korea.
ACS Nano
|September 5, 2013
Summary
Researchers developed a method to prevent graphene sheets from restacking using melamine resin. This creates a porous graphene composite with a large surface area, ideal for high-performance supercapacitors.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Graphene's unique properties are hindered by sheet restacking in scalable synthesis.
- Intercalated water molecules in graphene oxide (GO) contribute to restacking.
- Restacking diminishes graphene's material advantages.
Purpose of the Study:
- To inhibit restacking in graphene oxide (GO) sheets during scalable synthesis.
- To develop a novel method for producing high-surface-area graphene composites.
- To evaluate the electrochemical performance of the resulting graphene composite for supercapacitors.
Main Methods:
- Treated graphene oxide (GO) with melamine resin (MR) monomers to eliminate water-mediated hydrogen bonding.
- Utilized condensation reactions for GO sheet modification.
- Subjected the treated GO to thermal treatment to form a carbonaceous composite.
Main Results:
- Achieved restacking-inhibited, porous graphene sheets.
- Obtained a carbonaceous composite with a large surface area (1040 m²/g).
- Demonstrated excellent supercapacitor performance: 210 F/g capacitance, minimal loss over 20,000 cycles, and ~7s rate capability.
Conclusions:
- Melamine resin (MR) effectively prevents graphene oxide (GO) restacking by disrupting hydrogen bonding.
- Condensation reactions involving GO sheets offer a general strategy for scalable synthesis of restacking-inhibited graphene.
- The developed graphene composite shows significant potential as an electrode material for advanced supercapacitors.
