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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Partially reduced graphite oxide as an electrode material for electrochemical double-layer capacitors
Moritz M Hantel1, Tommy Kaspar, Reinhard Nesper
1Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 16, 2012
Summary
Partially reduced graphite oxide shows tunable electrochemical properties. Its capacitance is influenced by graphene layer distance and oxygen content, with optimal performance achieved using acetonitrile as a solvent.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Graphite oxide (GO) is a precursor for advanced carbon materials.
- Controlling the reduction degree of GO is crucial for tuning its properties.
- Partially reduced graphite oxide (rGO) offers tunable electrochemical performance.
Purpose of the Study:
- To synthesize partially reduced graphite oxide (rGO) from graphite oxide.
- To investigate the effect of reduction degree on rGO's electrochemical activation.
- To determine the optimal conditions for achieving high capacitance in rGO-based electrochemical devices.
Main Methods:
- Synthesis of partially reduced graphite oxide from graphite oxide using synthetic graphite.
- Characterization of rGO using elemental analysis and EDX to determine oxygen content and layer distance.
- Electrochemical activation of rGO in tetraethylammonium tetrafluoroborate electrolyte using acetonitrile and propylene carbonate solvents.
- Measurement of differential capacitance using cyclic voltammetry and electrochemical impedance spectroscopy.
Main Results:
- Reduction of graphite oxide decreased its layer distance and oxygen functionalities.
- Electrochemical activation potential was dependent on the degree of reduction, layer distance, and solvent.
- Higher layer distances correlated with lower activation potentials for both positive and negative activation.
- A layer distance of 0.43 nm with acetonitrile solvent yielded a capacitance of 220 Fg⁻¹ for the positive electrode and 195 Fg⁻¹ in a symmetric full-cell assembly.
Conclusions:
- The electrochemical properties of partially reduced graphite oxide are significantly influenced by its structural characteristics, including layer distance and oxygen content.
- The choice of solvent plays a critical role in the electrochemical activation process and resulting capacitance.
- Partially reduced graphite oxide demonstrates potential as an electrode material for supercapacitors, with tunable properties for optimized performance.
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