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Graphene quantum dots as the electrolyte for solid state supercapacitors.

Su Zhang¹, Yutong Li¹, Huaihe Song¹

¹State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

Scientific Reports

|January 15, 2016

Summary

This summary is machine-generated.

Graphene quantum dots (GQDs) with neutralized acidic groups act as improved electrolytes for supercapacitors. This neutralization enhances ionic conductivity, boosting supercapacitor performance and rate capability.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Supercapacitors require efficient electrolytes for optimal energy storage.
Graphene quantum dots (GQDs) possess functional groups that can be modified for electrochemical applications.

Purpose of the Study:

To investigate the potential of graphene quantum dots (GQDs) as electrolytes for supercapacitors.
To enhance the performance of GQDs as electrolytes by modifying their acidic functional groups.

Main Methods:

Synthesizing GQDs with abundant oxygen-bearing functional groups (-COOH, -OH).
Neutralizing acidic functional groups on GQDs using potassium hydroxide (KOH).
Evaluating the performance of neutralized GQDs as both solution- and solid-type electrolytes in supercapacitors.

Main Results:

Neutralization of acidic groups in GQDs significantly improved ionic conductivity and ion-donating ability.
Supercapacitors utilizing neutralized GQDs as electrolytes exhibited enhanced capacitive performance.
The rate capability of supercapacitors was markedly improved with the use of neutralized GQDs.

Conclusions:

Modified graphene quantum dots show promise as advanced electrolytes for high-performance supercapacitors.
Neutralization of acidic functional groups is a viable strategy to enhance GQD electrolyte properties.
The enhanced performance is attributed to the full ionization of functional groups after neutralization.