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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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Sonochemically synthesized MnO2 nanoparticles as electrode material for supercapacitors.

Balasubramaniam Gnana Sundara Raj¹, Abdullah M Asiri², Abdullah H Qusti²

¹Nanomaterials and Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology, Trichy 620 015, India.

Ultrasonics Sonochemistry

|December 24, 2013

Summary

Manganese oxide nanoparticles were synthesized using a rapid sonochemical method. The resulting nanomaterial demonstrated high specific capacitance and excellent electrochemical stability for supercapacitor applications.

Keywords:

Amorphous materials Electrochemical properties Energy storage Sonochemical synthesis Supercapacitor X-ray diffraction

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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate

Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate

Published on: June 18, 2020

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Supercapacitors are crucial energy storage devices.
Developing efficient electrode materials is key to improving supercapacitor performance.
Manganese oxide (MnO2) is a promising material due to its high theoretical capacitance.

Purpose of the Study:

To synthesize manganese oxide (MnO2) nanoparticles using a facile and rapid sonochemical method.
To characterize the synthesized MnO2 nanoparticles.
To evaluate the electrochemical performance of MnO2 nanoparticles in a supercapacitor device.

Main Methods:

Sonochemical reduction of potassium permanganate (KMnO4) using polyethylene glycol (PEG).
Characterization using powder X-ray diffraction (XRD), FT-IR, SEM, TEM, and BET analysis.
Fabrication and testing of a supercapacitor device with MnO2 nanoparticles as the electrode material.

Main Results:

Successfully synthesized MnO2 nanoparticles at room temperature in a short time.
Achieved a maximum specific capacitance of 282 Fg⁻¹ at 0.5 mAcm⁻² in 1M Ca(NO3)2 electrolyte.
Demonstrated high electrochemical stability with 78% capacitance retention after 1000 cycles.

Conclusions:

The sonochemical synthesis method is effective for producing high-performance MnO2 nanoparticles.
The synthesized MnO2 nanoparticles exhibit excellent potential as electrode materials for supercapacitors.
The developed supercapacitor shows promising energy storage capabilities and long-term stability.