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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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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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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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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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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Bioactive Ion-Based Switchable Supercapacitors.

Panlong Li1, Yannik Bräuniger1, Jonas Kunigkeit2

  • 1Inorganic Chemistry I, Technische Universität Dresden, Bergstrasse 66, 01069, Dresden, Germany.

Angewandte Chemie (International Ed. in English)
|October 19, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces the first bioactive ion-based switchable supercapacitor using choline chloride and porous carbons. It demonstrates controllable ion uptake and release for advanced applications.

Keywords:
CholineElectrosorptionIontronic ArchitecturePorous CarbonSwitchable Supercapacitor

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Switchable supercapacitors (SCs) utilize porous carbon electrodes for reversible, electrically-driven ion uptake/release.
  • Bioactive ion manipulation is crucial for applications like drug delivery and neuromodulation.

Purpose of the Study:

  • To demonstrate the first bioactive ion-based switchable supercapacitor.
  • To elucidate the adsorption mechanisms of choline chloride in porous carbons.
  • To propose a novel device for in situ monitoring of bioactive ion adsorption.

Main Methods:

  • Utilized nuclear magnetic resonance, Raman spectroscopy, and impedance spectroscopy to study adsorption mechanisms.
  • Developed a 4-terminal device with main and detective capacitors for in situ monitoring.
  • Fabricated printable choline-based switchable SCs for ion concentration control.

Main Results:

  • Unraveled the interplay between physisorption and electrosorption of choline chloride.
  • Demonstrated that weak physisorption enables electrically-driven electrolyte depletion and controllable ion exchange.
  • Achieved significant capacitance switching down to 8.3% residual capacitance in printed devices.

Conclusions:

  • Established a novel bioactive ion-based switchable supercapacitor.
  • The findings provide insights into adsorption mechanisms for controllable ion manipulation.
  • This work paves the way for advanced applications in drug delivery, neuromodulation, and neuromorphic devices.