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Related Concept Videos

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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Energy Stored in a Capacitor01:12

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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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Energy Stored in Capacitors01:10

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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.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
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RC Circuits: Charging A Capacitor01:30

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A circuit containing resistance and capacitance is called an RC circuit. A capacitor is an electrical component that stores electric charge by storing energy in an electric field. Consider a simple RC circuit having a DC (direct current) voltage source ε, a resistor R, a capacitor C, and a two-way position switch. In the circuit, the capacitor can be charged or discharged depending on the position of the switch.
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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.
Capacitor-discharge ignition is a type of ignition system commonly found in small engines where the energy released from a capacitor ignites an induction coil that, in turn, fires the spark plug.
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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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Moisture-enabled self-charging and voltage stabilizing supercapacitor.

Lifeng Wang1,2,3,4, Haiyan Wang2, Chunxiao Wu1,2

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, PR China.

Nature Communications
|June 10, 2024
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Summary
This summary is machine-generated.

This study introduces a flexible moisture-powered supercapacitor (mp-SC) that self-charges using ambient moisture and maintains stable voltage. This innovation addresses charging and self-discharging issues in portable electronics.

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Area of Science:

  • Materials Science
  • Energy Storage
  • Electrochemistry

Background:

  • Supercapacitors are crucial for portable electronics but suffer from frequent charging and rapid self-discharging.
  • Existing energy storage solutions often lack long-term stability and self-charging capabilities.

Purpose of the Study:

  • To develop a flexible moisture-powered supercapacitor (mp-SC) with self-charging and voltage-stabilizing properties.
  • To overcome the limitations of conventional supercapacitors in portable electronic applications.

Main Methods:

  • Integration of a polyelectrolyte-based moist-electric generator for moisture-induced ion diffusion.
  • Utilizing a graphene electrochemical capacitor for charge storage.
  • Synergistic combination of these components in a flexible device architecture.

Main Results:

  • The mp-SC exhibits a self-charged high areal capacitance of 138.3 mF cm⁻².
  • Demonstrated ~96.6% voltage maintenance over 120 hours.
  • A large-scale device (72 units in series) achieved a self-charged 60 V output in air, powering commercial electronics.

Conclusions:

  • The developed mp-SC offers a promising solution for self-powered and ultra-long-term stable energy storage.
  • This technology has significant potential for practical applications in flexible and portable electronics.
  • The findings provide insights into designing self-charging supercapacitors and other advanced energy storage devices.