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MOS Capacitor01:25

MOS Capacitor

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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.
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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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In 1749, Benjamin Franklin coined the word battery for a series of capacitors connected to store energy. Capacitors store electric potential energy that can be released over a short time. This property means capacitors have a wide range of applications.
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Solid-state supercapacitor based on activated carbon cloths exhibits excellent rate capability.

Gongming Wang1, Hanyu Wang, Xihong Lu

  • 1Department of Chemistry and Biochemistry, University of California, Santa Cruz, California, 95064, USA.

Advanced Materials (Deerfield Beach, Fla.)
|February 6, 2014
PubMed
Summary

Activated carbon cloth electrodes demonstrate high capacitance for supercapacitors. These solid-state devices exhibit excellent rate capability, retaining capacitance at high charge/discharge rates.

Keywords:
activated-carbon clothenergy storagerate capabilitysolid-state supercapacitorsultrafast charging

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors are crucial for energy storage applications.
  • Developing high-performance electrodes is key to advancing supercapacitor technology.
  • Activated carbon materials offer promising electrochemical properties.

Purpose of the Study:

  • To investigate the electrochemical performance of activated carbon cloth as a standalone electrode material.
  • To evaluate the performance of a symmetric solid-state supercapacitor utilizing activated carbon cloth electrodes.
  • To assess the rate capability and capacitance retention of the supercapacitor device.

Main Methods:

  • Fabrication of electrodes using activated carbon cloth.
  • Assembly of a symmetric solid-state supercapacitor device.
  • Electrochemical characterization including capacitance measurements and rate capability tests.

Main Results:

  • The activated carbon cloth electrode achieved an excellent areal capacitance of 88 mF/cm(2) (8.8 mF/g) without additional capacitive materials.
  • The symmetric solid-state supercapacitor demonstrated remarkable charge/discharge rate capability.
  • 50% of the capacitance was retained even when the charging rate increased significantly from 10 to 10,000 mV/s.

Conclusions:

  • Activated carbon cloth is a highly effective electrode material for supercapacitors.
  • The developed solid-state supercapacitor exhibits superior rate performance.
  • This research highlights the potential of activated carbon cloth in advanced energy storage solutions.