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Chemical Tuning of Specific Capacitance in Functionalized Fluorographene
Eleni C Vermisoglou1, Petr Jakubec1, Aristides Bakandritsos1
1Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
Chemistry of Materials : a Publication of the American Chemical Society
|August 3, 2019
Summary
Researchers developed novel graphene derivatives for supercapacitors by controlling chemical composition. These materials show enhanced capacitance, offering a pathway to more efficient energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Graphene's high surface area and conductivity make it ideal for supercapacitors.
- Graphene restacking in electrolytes limits its performance.
- Covalent functionalization of graphene offers a route to improved electrode materials.
Purpose of the Study:
- To investigate the impact of chemical composition on the capacitance of graphene derivatives.
- To synthesize well-defined graphene derivatives with varying compositions but similar morphologies.
- To explore the relationship between functional group grafting, conductivity, and supercapacitor performance.
Main Methods:
- Controlled covalent functionalization of fluorographene with 5-aminoisophthalic acid.
- Characterization of graphene derivatives' chemical composition and morphology.
- Electrochemical testing of supercapacitor performance (gravimetric specific capacitance).
- Molecular dynamics simulations to understand ion-electrolyte interactions.
Main Results:
- Synthesized graphene derivatives with gravimetric specific capacitance ranging from 271 to 391 F g-1.
- Identified an optimal balance between functional groups and sp2 carbon network for maximum capacitance.
- Molecular dynamics revealed enhanced ionic concentration and hydration on functionalized surfaces.
- Demonstrated the importance of conductive and hydrophilic graphitic surfaces for supercapacitor electrodes.
Conclusions:
- Chemical composition significantly influences the capacitance of graphene derivatives.
- Covalent grafting of charged, ionophilic/hydrophilic groups enhances supercapacitor performance.
- Findings provide insights for designing advanced graphene-based electrode materials for energy storage.
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