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Related Concept Videos

Capacitors01:15

Capacitors

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.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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...
MOS Capacitor01:25

MOS Capacitor

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...
Capacitors and Capacitance01:18

Capacitors and Capacitance

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.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
Energy Stored in a Capacitor01:12

Energy Stored in a Capacitor

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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Related Experiment Video

Updated: May 24, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

Carbon-based electrochemical capacitors.

Arunabha Ghosh1, Young Hee Lee

  • 1Department of Energy Science, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, South Korea.

Chemsuschem
|March 6, 2012
PubMed
Summary

Supercapacitors utilize nanocarbons for superior energy storage. This review details pore contributions in activated carbons and explores novel materials like graphene for enhanced energy and power density in supercapacitors.

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors offer high energy density and power delivery, outperforming batteries and conventional capacitors.
  • Nanocarbons are primary electrode materials for supercapacitors due to abundance and cost-effectiveness.
  • Porous activated carbons are key for supercapacitor performance.

Purpose of the Study:

  • To analyze the capacitance performance of porous activated carbons.
  • To elucidate the role of micropores and mesopores in supercapacitor performance.
  • To explore novel nanocarbon materials and composites for advanced supercapacitors.

Main Methods:

  • Review of literature on porous activated carbons and nanocarbon materials.
  • Analysis of pore structure contributions (micropores, mesopores) to capacitance.

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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators

Published on: April 25, 2020

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Last Updated: May 24, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
14:42

Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators

Published on: April 25, 2020

  • Discussion of functionalization techniques and composite materials.

    • Main Results:

    • Detailed analysis of individual and combined contributions of micro- and mesopores.
    • Comparative performance of random vs. ordered porous nanocarbons.
    • Highlighting carbon nanotubes, graphene, and composites for improved performance.

    Conclusions:

    • Understanding pore structure is crucial for optimizing supercapacitor electrodes.
    • Nanocarbon composites with transition-metal oxides and conducting polymers show significant potential.
    • Future electrode design should focus on achieving high energy and power density through ideal composite structures.