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Related Concept Videos

MOS Capacitor01:25

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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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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.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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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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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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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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Magnetically Triggered Interplay of Capacitive and Diffusion Contributions for Boosted Supercapacitor Performance.

Peeyush Pandey1, Sourav Bhowmick1,2, Mohammad Qureshi1

  • 1Materials Science Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.

ACS Applied Materials & Interfaces
|August 11, 2023
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Summary

External magnetic fields enhance supercapacitor performance by tuning charge storage mechanisms. Doping with aluminum further optimizes capacitive behavior for improved charge-discharge characteristics in nickel cobalt copper carbonate hydroxide electrodes.

Keywords:
Al dopingcapacitivehigh energy densityion diffusionmagnetic dilution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Supercapacitors store energy via capacitive or ion-diffusion mechanisms, impacting power and energy density.
  • Controlling the interplay between these mechanisms is crucial for high-performance energy storage devices.
  • External magnetic fields offer a novel approach to tune supercapacitor electrochemical behavior.

Purpose of the Study:

  • To investigate the influence of external magnetic fields on the charge storage mechanisms of nickel cobalt copper carbonate hydroxide (NiCoCuCH).
  • To explore the effect of aluminum doping on the magnetic and electrochemical properties of NiCoCuCH for supercapacitor applications.
  • To optimize the performance of an asymmetric supercapacitor device using magnetic field manipulation.

Main Methods:

  • Synthesis and characterization of NiCoCuCH and aluminum-doped NiCoCuCH (Al-NiCoCuCH) electrodes.
  • Electrochemical testing of electrodes under varying external magnetic fields (0-250 mT).
  • Fabrication and evaluation of an asymmetric supercapacitor device (NiCoCuCH/AC) under optimal magnetic field conditions.

Main Results:

  • External magnetic fields modulated the capacitive and ion-diffusion contributions in both NiCoCuCH and Al-NiCoCuCH electrodes.
  • Ferromagnetic coupling enhancement under magnetic fields facilitated redox pathways, improving charge-discharge characteristics.
  • Al3+ doping increased capacitive contribution by altering crystal symmetry and restricting magnetic domain alignment, enhancing charge-discharge performance at the cost of energy density.

Conclusions:

  • External magnetic fields provide an effective means to control the charge storage mechanisms in NiCoCuCH-based supercapacitors.
  • Aluminum doping offers a strategy to further enhance capacitive behavior and improve charge-discharge characteristics.
  • An asymmetric supercapacitor device utilizing NiCoCuCH at 110 mT demonstrated excellent specific capacity, energy density, and power density.