Thermally reduced fluorographenes as efficient electrode materials for supercapacitors.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Growing global energy demands necessitate advanced supercapacitor electrode materials.
• Fluorographene presents significant potential for next-generation supercapacitor development.
• Existing preparation methods lack simplicity and scalability.

Purpose of the Study:

• To develop a simple and scalable method for preparing supercapacitor electrode materials.
• To investigate the effect of controlled reduction on fluorographene properties.
• To optimize fluorographene derivatives for high-performance supercapacitors.

Main Methods:

• Isothermal reduction of fluorographite at 450 °C under a hydrogen atmosphere.
• Time control during reduction to tune fluorine content and electronic properties.
• Characterization of thermally reduced fluorographenes (TRFGs) for electrochemical performance.

Main Results:

• Controlled reduction fine-tuned fluorine content and electronic properties of fluorographene.
• Charge transfer resistance (Rct) exhibited a V-shaped trend with reduction time.
• Specific capacitance followed a V-shaped trend, linked to sp3 carbon content and defects.
• Optimized TRFG achieved 539 F g⁻¹ specific capacitance at 0.25 A g⁻¹.
• Exceptional cycling stability: 100% retention after 1500 cycles (3-electrode) and 96.7% after 30,000 cycles (2-electrode).

Conclusions:

• Time-controlled isothermal reduction is an effective strategy for preparing high-performance fluorographene-based supercapacitor electrodes.
• The optimized fluorographene derivative demonstrates superior energy storage capacity and durability.
• This method offers a scalable approach for producing advanced materials for practical supercapacitor applications.