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Related Concept Videos

RC Circuits: Charging A Capacitor01:30

RC Circuits: Charging A Capacitor

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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.
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Energy Stored in a Capacitor01:12

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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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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.
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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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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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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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Piezoelectric-driven self-charging supercapacitor power cell.

Ananthakumar Ramadoss, Balasubramaniam Saravanakumar, Seung Woo Lee

  • 1⊥Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, China.

ACS Nano
|March 22, 2015
PubMed
Summary

This study presents a self-charging supercapacitor power cell (SCSPC) that converts mechanical energy into electrical energy using piezoelectric materials. The device, utilizing MnO2 nanowires and PVDF-ZnO, demonstrates practical self-charging capabilities for flexible electronics.

Keywords:
energy harvestingenergy storagepiezoelectric separatorself-charging

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Area of Science:

  • Materials Science
  • Energy Storage
  • Nanotechnology

Background:

  • Piezoelectric materials offer a route to harvest mechanical energy.
  • Supercapacitors are crucial for efficient energy storage.
  • Integrating energy harvesting and storage is key for self-powered devices.

Purpose of the Study:

  • To fabricate a novel piezoelectric-driven self-charging supercapacitor power cell (SCSPC).
  • To demonstrate the direct conversion of mechanical energy into electrochemical energy.
  • To explore the potential of SCSPC as a self-sufficient power source for flexible electronics.

Main Methods:

  • Fabrication of SCSPC using MnO2 nanowires as electrodes and a PVDF-ZnO film as a piezoelectric separator.
  • Integration of a nanogenerator, supercapacitor, and power management system.
  • Testing self-charging capability via mechanical deformation (human palm impact).

Main Results:

  • The SCSPC successfully converted mechanical energy into electrochemical energy.
  • Achieved a charge of 110 mV (vs. aluminum foil) in 300 seconds under palm impact.
  • Demonstrated powering a green light-emitting diode using serially connected SCSPCs.

Conclusions:

  • Developed a functional piezoelectric-driven self-charging supercapacitor power cell.
  • Validated the direct conversion of mechanical impact into usable electrical energy.
  • Opened possibilities for self-powered flexible hybrid electronic devices.