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MOS Capacitor

MOS Capacitor

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

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Published on: January 7, 2022

Binder-Free MnO₂/MWCNT/Al Electrodes for Supercapacitors.

Arkady N Redkin¹, Alena A Mitina¹, Eugene E Yakimov¹

¹Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Science (IMT RAS), Moscow District, 6 Academician Ossipyan Str., 142432 Chernogolovka, Russia.

Nanomaterials (Basel, Switzerland)

|September 9, 2022

Summary

Researchers developed a new, simple method to create binder-free manganese dioxide/multi-walled carbon nanotube/aluminum (MnO2/MWCNT/Al) composite electrodes for supercapacitors, significantly boosting performance and stability.

Keywords:

MnO2/CNT composite binder-free electrodes carbon nanotubes on aluminum foil pseudocapacitance supercapacitors

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Supercapacitor performance is advancing through composite electrodes combining charge storage mechanisms.
Existing methods for composite electrodes can be complex or require binders, impacting efficiency.

Purpose of the Study:

To propose a novel, straightforward method for fabricating binder-free manganese dioxide/multi-walled carbon nanotube/aluminum (MnO2/MWCNT/Al) composite electrodes.
To optimize the preparation conditions for these electrodes to enhance supercapacitor performance.
To evaluate the electrochemical properties and stability of the developed composite electrodes.

Main Methods:

Direct growth of multi-walled carbon nanotubes (MWCNTs) on aluminum foil via catalytic pyrolysis of ethanol vapor.
Treatment of MWCNT/Al samples with an aqueous potassium permanganate (KMnO4) solution under mild conditions to form MnO2.
Characterization using electron probe microanalysis (EPMA), Raman spectroscopy, cyclic voltammetry (CV), and impedance spectroscopy.

Main Results:

Optimal preparation involved treating MWCNT/Al with 1% KMnO4 for 40 min, yielding MnO2/MWCNT/Al electrodes.
Specific capacitance increased threefold, reaching 100-120 F/g, with excellent adhesion and electrical contact.
Electrodes demonstrated excellent charge/discharge characteristics and stability, retaining <20% capacitance after 60,000 cycles.

Conclusions:

The proposed method offers a facile route to high-performance, binder-free MnO2/MWCNT/Al supercapacitor electrodes.
Directly deposited MWCNT/Al serves as a promising material for fabricating advanced composite electrodes.
This approach enhances supercapacitor energy storage capabilities and durability.