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MOS Capacitor01:25

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Updated: May 20, 2025

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

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Anion engineering in lithium cobalt oxide for application in high-performance supercapacitors.

Seyedeh Maryam Hashemzadeh1, Alireza Khorshidi2, Majid Arvand1

  • 1Department of Inorganic Chemistry, Faculty of Chemistry, University of Guilan, P.O. Box: 41335-1914, Rasht, Iran.

Scientific Reports
|March 25, 2025
PubMed
Summary

Researchers enhanced supercapacitor performance by modifying lithium cobalt oxide

Keywords:
Anion engineeringAnion exchangeEnergy storageLithium cobalt oxideSol–gelSupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors are vital for energy storage but face limitations in energy density compared to batteries.
  • Improving supercapacitor energy density is a key challenge in the field.
  • Lithium cobalt oxide is a common material, but its anionic structure offers potential for enhancement.

Purpose of the Study:

  • To enhance the energy density and charge storage capability of supercapacitors.
  • To investigate the effect of modifying the anionic structure of lithium cobalt oxide.
  • To synthesize and characterize novel lithium cobalt oxide derivatives for improved supercapacitor performance.

Main Methods:

  • Sol-gel method for initial lithium cobalt oxide synthesis.
  • Anion-exchange method to create LiCoO2-x(F0.8Cl0.2)x derivatives.
  • Characterization using FTIR, XRD, XPS, FESEM, and TEM.
  • Charge-discharge testing to evaluate electrochemical performance.

Main Results:

  • Synthesized LiCoO1.6(F0.8Cl0.2)0.4 demonstrated a high specific capacitance of 522.16 F g-1 at 1 A g-1.
  • The modified electrode exhibited excellent cycle life stability.
  • Achieved 92.04% coulombic efficiency after 4000 charge-discharge cycles.

Conclusions:

  • Modifying the anionic structure of lithium cobalt oxide significantly enhances supercapacitor energy density and charge storage.
  • The synthesized LiCoO1.6(F0.8Cl0.2)0.4 is a promising material for high-performance supercapacitors.
  • Anion modification offers a viable strategy for advancing supercapacitor technology.