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Related Concept Videos

Energy Stored in a Capacitor01:12

Energy Stored in a Capacitor

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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

Energy Stored in Capacitors

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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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Energy Stored in a Capacitor: Problem Solving01:26

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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.
To calculate the energy stored in a capacitor of...
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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.
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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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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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.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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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.
Consider a purely capacitive circuit consisting...
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Related Experiment Video

Updated: Nov 12, 2025

Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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Amorphous cellulose nanofiber supercapacitors.

Mikio Fukuhara1, Tomoyuki Kuroda2, Fumihiko Hasegawa2

  • 1New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan. mikio.fukuhara.b2@tohoku.ac.jp.

Scientific Reports
|March 20, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed the first amorphous cellulose nanofiber (ACN) supercapacitor for electrical energy storage. This novel material demonstrates significant electroadsorption capabilities, paving the way for new energy storage solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Cellulose nanofibers (CNFs) are of significant interest for various applications.
  • However, their potential for electrical energy storage remains unexplored.

Purpose of the Study:

  • To investigate the electroadsorption effects and energy storage capabilities of amorphous cellulose nanofibers (ACFs).
  • To present the first supercapacitor based on ACFs.

Main Methods:

  • Fabrication of an amorphous cellulose nanofiber (ACF) based supercapacitor.
  • Characterization of its electrical energy storage performance and electroadsorption mechanisms.

Main Results:

  • The ACF supercapacitor exhibits significant electrical energy storage (221 mJm-2, 13.1 Wkg-1).
  • Enhanced electroadsorption is attributed to quantum-size, offset, and electrostatic effects.
  • The supercapacitor captures atmospheric and vacuum electricity, powering an LED.

Conclusions:

  • Amorphous cellulose nanofibers show promise for electrical energy storage applications.
  • The developed supercapacitor offers a novel approach to energy storage.
  • Integration with nano-electromechanical systems (NEMS) may further enhance performance.