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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Preparation of supercapacitor electrodes through selection of graphene surface functionalities
Linfei Lai1, Huanping Yang, Liang Wang
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
ACS Nano
|May 29, 2012
Summary
Amine-modified reduced graphene oxide (NH(2)-RG-O) composites with polyaniline (PANi) significantly boost supercapacitor performance. This graphene surface chemistry modification leads to high capacitance and excellent cycling stability for energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Graphene/polyaniline composites are promising for supercapacitors.
- Surface chemistry of graphene significantly impacts composite performance.
- Tailoring graphene functional groups is crucial for optimizing electrochemical properties.
Purpose of the Study:
- To investigate how different graphene surface chemistries affect the electrochemical performance of graphene/polyaniline composites.
- To evaluate the role of amine functionalization on graphene for supercapacitor applications.
- To correlate surface functional groups with polyaniline growth and resulting capacitance.
Main Methods:
- Synthesis of graphene oxide (G-O), reduced G-O (RG-O), nitrogen-doped RG-O (N-RG-O), and amine-modified RG-O (NH(2)-RG-O).
- Loading approximately 9 wt % polyaniline (PANi) onto the modified graphene carriers.
- Surface chemistry analysis using Fourier-transform infrared spectroscopy (FTIR), Near-edge X-ray absorption fine structure (NEXAFS), and X-ray photoelectron spectroscopy (XPS).
- Electrochemical performance testing in a three-electrode system and supercapacitor cell configuration.
Main Results:
- The NH(2)-RG-O/PANi composite demonstrated the highest specific capacitance, reaching 500 F g(-1).
- This composite also exhibited superior cyclability, with no capacitance loss over 680 cycles.
- A NH(2)-RG-O/PANi//N-RG-O supercapacitor cell achieved a capacitance of 79 F g(-1).
Conclusions:
- Introducing amine (-NH(2)) groups to reduced graphene oxide is critical for enhancing supercapacitor performance.
- Amine functionalization promotes polyaniline growth, leading to significantly improved capacitance and long-term cycling stability.
- This study underscores the importance of surface chemistry engineering in graphene-based materials for advanced energy storage devices.
