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Related Concept Videos

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.
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...
Energy Stored in a Capacitor: Problem Solving01:26

Energy Stored in a Capacitor: Problem Solving

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...
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...
Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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...
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...

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Related Experiment Video

Updated: Jun 6, 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

Graphene-based supercapacitor with an ultrahigh energy density.

Chenguang Liu1, Zhenning Yu, David Neff

  • 1Nanotek Instruments, Inc.

Nano Letters
|November 10, 2010
PubMed
Summary

This study presents a high-performance supercapacitor using curved graphene electrodes. It achieves energy densities comparable to batteries but with rapid charging capabilities, offering a promising energy storage solution.

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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
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Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

Published on: November 5, 2015

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Last Updated: Jun 6, 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

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
10:23

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

Published on: November 5, 2015

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors offer rapid charge/discharge but often lag behind batteries in energy density.
  • Graphene's high surface area is ideal for supercapacitors, but restacking limits its potential.
  • Developing advanced electrode materials is crucial for next-generation energy storage devices.

Purpose of the Study:

  • To enhance the energy density and performance of graphene-based supercapacitors.
  • To overcome the challenge of graphene sheet restacking in electrode fabrication.
  • To explore the use of curved graphene architectures for improved ion accessibility.

Main Methods:

  • Fabrication of curved graphene sheets to prevent face-to-face restacking.
  • Utilization of single-layer graphene's intrinsic capacitance and surface area.
  • Testing supercapacitor performance with environmentally benign ionic liquids at voltages >4 V.

Main Results:

  • Achieved specific energy densities of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C.
  • Demonstrated energy density comparable to Nickel metal hydride batteries.
  • Enabled rapid charging and discharging within seconds to minutes.

Conclusions:

  • Curved graphene morphology effectively prevents restacking, maximizing surface area utilization.
  • The developed supercapacitor exhibits competitive energy density and superior charge/discharge rates.
  • This approach paves the way for high-performance, fast-charging energy storage systems.