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MOS Capacitor

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

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Corncob-Derived Activated Carbon as Electrode Material for High-Performance Supercapacitor.

Lili Dong^1,2, Chenghao Pan^1,2, Yongfeng Ji^1,2

¹Institute of Urban & Rural Mining, Changzhou University, Changzhou 213164, China.

Materials (Basel, Switzerland)

|September 14, 2024

Summary

Corncob-derived activated carbon offers a sustainable path to high-performance supercapacitors. This study optimized its preparation, yielding excellent energy storage and stability for biomass waste applications.

Keywords:

activated carbon biomass corncob specific capacitance supercapacitors

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Area of Science:

Materials Science
Electrochemistry
Sustainable Chemistry

Background:

Activated carbon is crucial for energy storage devices.
Biomass waste presents an underutilized resource for material synthesis.

Purpose of the Study:

To prepare activated carbon from corncob for supercapacitor applications.
To investigate the effect of preparation parameters on activated carbon properties.
To evaluate the electrochemical performance of corncob-derived activated carbon.

Main Methods:

Corncob precursor underwent carbonization and KOH activation.
Alkaline/biochar ratios (3:1–5:1) and activation temperatures (700–900 °C) were varied.
Characterization of morphology, microstructure, and electrochemical performance.

Main Results:

Optimized activated carbon (CAC700-4) showed a porous structure with micro/mesopores.
Specific capacitance reached 260 F/g at 1 A/g.
Symmetric supercapacitor demonstrated 14.3 Wh/kg energy density and 95.5% capacitance retention after 10,000 cycles.

Conclusions:

Corncob is a viable precursor for high-performance activated carbon.
Optimized activated carbon exhibits excellent potential for supercapacitor applications.
This research highlights biomass waste valorization for advanced energy storage.