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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Capacitors01:15

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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Capacitor in an AC Circuit01:23

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A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
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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.
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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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Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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3-V Solid-State Flexible Supercapacitors with Ionic-Liquid-Based Polymer Gel Electrolyte for AC Line Filtering.

Yu Jin Kang1, Yongju Yoo1, Woong Kim1

  • 1Department of Materials Science and Engineering, Korea University , Seoul 02841, Republic of Korea.

ACS Applied Materials & Interfaces
|May 12, 2016
PubMed
Summary

Researchers developed a 3-V flexible supercapacitor using ionic-liquid electrolytes and carbon nanotubes. This advancement significantly boosts energy density for AC line filtering in electronics.

Keywords:
AC line filtercarbon nanotubeflexible supercapacitorion gelpower performance

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Flexible supercapacitors are crucial for AC line filtering but limited by low energy density.
  • Aqueous gel electrolytes restrict cell voltage to 1 V, hindering performance.

Purpose of the Study:

  • To develop a high-voltage, flexible supercapacitor for AC line filtering applications.
  • To overcome the energy density limitations of current flexible supercapacitors.

Main Methods:

  • Utilized an ionic-liquid-based polymer gel electrolyte.
  • Employed carbon nanotube materials for electrodes.
  • Fabricated and tested a 3-V flexible supercapacitor device.

Main Results:

  • Achieved a 3-V cell voltage, a significant increase from 1 V.
  • Demonstrated a >20x higher areal energy density (0.66 μWh/cm²) compared to previous devices.
  • Maintained excellent capacitive behavior at 120 Hz with a 1 ms time constant and 1.5 W/cm² power density.

Conclusions:

  • The 3-V flexible supercapacitor offers a viable solution for high-frequency AC line filtering.
  • This technology enhances energy density and performance for wearable and portable electronics.
  • Ionic-liquid electrolytes and carbon nanotubes are key to achieving higher voltage and energy in flexible supercapacitors.