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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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Probing Photo-Assisted Charge Storage Mechanism Using Bi-Fe Perovskite Oxide Electrode for Solar Supercapacitor.

Manopriya Samtham1, Ajay Patil1, Ekta Choudhary1,2

  • 1Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.

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|December 23, 2024
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Summary
This summary is machine-generated.

Bismuth ferrite (BiFeO3) nanoparticles enhance photo-assisted supercapacitors by improving charge storage and kinetics. This material shows promising performance under illumination for energy storage applications.

Keywords:
BiFeO3 particlesphoto efficiencysolar supercapacitorspecific capacitance

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrode materials is crucial for advanced energy storage devices.
  • Photo-assisted supercapacitors offer enhanced performance by utilizing light energy.
  • Bismuth ferrite (BiFeO3) is a multiferroic material with potential for electrochemical applications.

Purpose of the Study:

  • To synthesize and characterize bismuth ferrite (BiFeO3) nanoparticles.
  • To explore BiFeO3 as an electrode material for photo-assisted supercapacitors.
  • To investigate the electronic structure and charge storage mechanisms under illumination.

Main Methods:

  • Sol-gel auto-combustion synthesis of rhombohedral BiFeO3 nanoparticles (≈100 nm).
  • Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge.
  • Resonant photoemission spectroscopy to study electronic structure and charge transfer.

Main Results:

  • BiFeO3 exhibited an energy bandgap of ≈2.31 eV.
  • Heterovalent Bi and Fe elements accelerated electrochemical redox kinetics and photo-assisted charge storage.
  • Achieved 26.77% photo efficiency, enhanced specific capacity of 21 Cg⁻¹ at 2 Ag⁻¹, and 77.5% capacitance retention after 1000 cycles under illumination.

Conclusions:

  • BiFeO3 is a promising electrode material for photo-assisted supercapacitors.
  • Fe-O hybridization facilitates charge transfer transitions, enhancing ion intercalation.
  • Accelerated photo-generated charge carrier separation and storage contribute to improved performance.