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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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MOS Capacitor01:25

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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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RC Circuits: Charging A Capacitor01:30

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A circuit containing resistance and capacitance is called an RC circuit. A capacitor is an electrical component that stores electric charge by storing energy in an electric field. Consider a simple RC circuit having a DC (direct current) voltage source ε, a resistor R, a capacitor C, and a two-way position switch. In the circuit, the capacitor can be charged or discharged depending on the position of the switch.
When the switch is moved to connect the battery, the circuit reduces to a simple...
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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.
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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.
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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.
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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A multi-responsive healable supercapacitor.

Haili Qin1, Ping Liu1, Chuanrui Chen1

  • 1Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, P. R. China.

Nature Communications
|July 15, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a self-healing supercapacitor using magnetic hydrogel electrodes. This device offers fast optical and magnetic healing, high capacitance, and potential for reliable next-generation electronics.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Self-healability is crucial for supercapacitor reliability and longevity in electronic devices.
  • Current healable supercapacitors often suffer from low capacitance and limited responsiveness.

Purpose of the Study:

  • To develop a multi-responsive, healable supercapacitor with enhanced performance and intelligence.
  • To investigate novel healing mechanisms triggered by optical, electrical, and magnetic stimuli.

Main Methods:

  • Fabrication of magnetic Fe3O4@Au/polyacrylamide (MFP) hydrogel electrodes and electrolytes.
  • Integration of silver nanowire films as current collectors.
  • Incorporation of electroactive polypyrrole nanoparticles into the MFP framework.

Main Results:

  • The supercapacitor demonstrated high mechanical strength and fast optical/magnetic healing via photothermal/magneto-thermal effects.
  • Triply-responsive healing was achieved under optical, electrical, and magnetic stimuli.
  • A record areal capacitance of 1264 mF cm⁻² was obtained, with ~90% capacitance retention over ten healing cycles.

Conclusions:

  • The developed multi-responsive healable supercapacitor offers superior performance and reliability.
  • The facile assembly and robust healing properties position this technology for advanced electronic applications.