Graphite-Mediated Microwave-Exfoliated Graphene Fluoride as Supercapacitor Electrodes

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Graphene fluoride (GF) is a promising material for energy storage applications.
• Efficient and scalable exfoliation methods for GF are crucial for its practical use.
• Microwave-assisted synthesis offers rapid and energy-efficient material processing.

Purpose of the Study:

• To develop a rapid solid-state exfoliation method for graphite fluoride (GrF) using microwave irradiation.
• To characterize the exfoliated graphene fluoride (GF) and evaluate its electrochemical performance in supercapacitors.
• To explore methods for enhancing the surface area and electrochemical properties of GF.

Main Methods:

• Solid-state exfoliation of graphite fluoride using microwave irradiation.
• Density-based separation of exfoliated graphene fluoride in a solvent.
• Fabrication of pouch-cell supercapacitors using exfoliated GF electrodes and a microemulsion-based electrolyte.
• Electrochemical testing including cyclic voltammetry and galvanostatic charge-discharge.
• BET surface area analysis.

Main Results:

• Rapid exfoliation of GrF into few-layer, electrically conductive GF in seconds.
• Supercapacitors using GF electrodes exhibited electrical double-layer capacitance behavior.
• Gravimetric specific capacitance of 3.2 F g^-1 at 500 mA g^-1 and 3.1 F g^-1 at 5000 mA g^-1.
• BET specific surface areas of exfoliated GF ranged from approximately 60-80 m² g^-1.

Conclusions:

• Microwave-assisted exfoliation is an efficient method for producing few-layer graphene fluoride.
• Exfoliated GF shows potential for use in supercapacitor electrodes.
• Further enhancement of GF surface area via activation can improve electrochemical performance.