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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

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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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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 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.
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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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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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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Holey graphene frameworks for highly efficient capacitive energy storage.

Yuxi Xu1, Zhaoyang Lin1, Xing Zhong1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.

Nature Communications
|August 9, 2014
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Researchers developed a novel 3D holey graphene framework electrode for high-performance supercapacitors. This advanced material significantly boosts energy density, approaching battery levels for mobile power applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors are crucial for electrochemical energy storage but often suffer from low energy density.
  • Developing advanced electrode materials is key to overcoming this limitation.

Purpose of the Study:

  • To engineer a high-performance, binder-free supercapacitor electrode using a novel material.
  • To enhance both gravimetric and volumetric energy densities for practical applications.

Main Methods:

  • Fabrication of a three-dimensional holey graphene framework with a hierarchical porous structure.
  • Characterization of the electrode's electrochemical performance in an organic electrolyte.
  • Assembly and testing of a fully packaged device stack.

Main Results:

  • The holey graphene framework electrode exhibited a high gravimetric capacitance of 298 F/g and volumetric capacitance of 212 F/cm³.
  • The device stack achieved gravimetric energy density of 35 Wh/kg and volumetric energy density of 49 Wh/L.
  • Performance metrics approached those of traditional lead-acid batteries.

Conclusions:

  • The developed holey graphene framework electrode offers a promising solution for high-energy-density supercapacitors.
  • This advancement bridges the performance gap between supercapacitors and batteries.
  • The material opens new possibilities for mobile power supplies in various applications.