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Related Concept Videos

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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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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Capacitors01:15

Capacitors

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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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Capacitor in an AC Circuit01:23

Capacitor in an AC Circuit

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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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Capacitors and Capacitance01:18

Capacitors and Capacitance

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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.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
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Energy Stored in a Capacitor: Problem Solving01:26

Energy Stored in a Capacitor: Problem Solving

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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.
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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A Shape-Memory Supercapacitor Fiber.

Jue Deng1, Ye Zhang1, Yang Zhao1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai 200438 (China).

Angewandte Chemie (International Ed. in English)
|November 4, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a flexible, stretchable fiber supercapacitor using carbon nanotubes and shape-memory polyurethane. This device maintains performance after being deformed and returning to its original shape, enabling shape-memory energy storage.

Keywords:
carbon nanotubesenergy storagepolymersshape memorysupercapacitors

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Area of Science:

  • Materials Science
  • Energy Storage
  • Nanotechnology

Background:

  • Flexible and stretchable electronics are crucial for wearable devices.
  • Supercapacitors offer high power density and long cycle life but often lack mechanical robustness.
  • Shape-memory materials provide unique capabilities for adaptive structures.

Purpose of the Study:

  • To develop a novel fiber-shaped supercapacitor with shape-memory properties.
  • To investigate the mechanical stability and electrochemical performance of the device under deformation.
  • To demonstrate the potential for shape-programmable energy storage.

Main Methods:

  • Fabrication of a fiber supercapacitor by winding aligned carbon nanotube sheets on a shape-memory polyurethane substrate.
  • Mechanical testing involving bending and stretching to induce and recover shape deformation.
  • Electrochemical characterization to assess performance during and after deformation.

Main Results:

  • The developed fiber supercapacitor exhibits excellent flexibility and stretchability.
  • The device successfully 'freezes' deformed shapes and recovers to its original state.
  • Electrochemical performance, including capacitance and stability, is well-maintained throughout deformation cycles.

Conclusions:

  • A novel shape-memory fiber supercapacitor has been successfully fabricated.
  • The device demonstrates robust electrochemical performance under significant mechanical deformation.
  • This technology opens new avenues for adaptive and wearable energy storage solutions.