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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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Electric Field of a Charged Disk01:23

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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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Capacitors and Capacitance01:18

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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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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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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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Updated: May 24, 2025

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Accelerating Charge Transfer in Supercapacitor Electrodes through Built-In Electric Fields.

Xiaofeng Zhang1,2,3, Zihua Wang1,2, Muhammad Sufyan Javed4

  • 1Guangzhou Institute of Blue Energy, Guangzhou 510555, China.

ACS Applied Materials & Interfaces
|February 28, 2025
PubMed
Summary
This summary is machine-generated.

Researchers engineered MXene electrodes with a built-in electric field (BIEF) to boost charge transfer in supercapacitors (SCs). This strategy significantly enhances electrochemical performance and device lifespan for advanced energy storage.

Keywords:
Ti2N/Ti3C2Txbuilt-in electric fieldinterface engineeringsupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors (SCs) require stable electrochemical performance and long lifespan for commercial viability.
  • Insufficient charge transfer in SC electrodes limits overall performance.
  • Interface engineering offers a promising strategy to overcome these limitations.

Purpose of the Study:

  • To enhance charge transfer in MXene-based supercapacitor electrodes.
  • To improve the electrochemical performance and cycling stability of supercapacitors.
  • To investigate the role of a built-in electric field (BIEF) at electrode interfaces.

Main Methods:

  • Developed Ti2N/Ti3C2Tx MXene composite as an electrode material.
  • Engineered a stable built-in electric field (BIEF) at the Ti2N/Ti3C2Tx interface.
  • Evaluated electrode performance in a three-electrode system and assembled a two-electrode device with activated carbon (AC).

Main Results:

  • The Ti2N/Ti3C2Tx electrode achieved a capacitance of 250.3 F g−1 and retained 63.6% capacitance at 20 A g−1.
  • Demonstrated outstanding cycling stability of 95.8% after 10,000 cycles at 10 A g−1.
  • The Ti2N/Ti3C2Tx//AC device showed an energy density of 50.8 Wh kg−1 and 96.77% capacity retention over 10,000 cycles.

Conclusions:

  • The BIEF effectively accelerates ion transport and surface adsorption/desorption, enhancing energy storage.
  • In-situ growth of Ti2N on Ti3C2Tx improves structural stability and BIEF persistence.
  • This interface engineering approach offers a new pathway for developing ultrastable, high-performance supercapacitors.