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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
Energy Stored in a Capacitor: Problem Solving01:26

Energy Stored in a Capacitor: Problem Solving

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.
Capacitor-discharge ignition is a type of ignition system commonly found in small engines where the energy released from a capacitor ignites an induction coil that, in turn, fires the spark plug.
To calculate the energy stored in a capacitor of...
MOS Capacitor01:25

MOS Capacitor

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...
Capacitors01:15

Capacitors

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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Updated: Jun 30, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

Published on: January 7, 2022

Machine Learning-Guided High-Efficiency and Thermally Stable Capacitive Energy Storage in Dielectric Capacitors With

Fei Yan1,2, Hongyu Yang1, Simin Wang3

  • 1School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 29, 2026
PubMed
Summary

Machine learning guided strontium titanate ceramics achieve high-efficiency, thermally stable capacitive energy storage. These advanced dielectric materials offer superior energy density and reliability for electronic systems.

Keywords:
dielectric capacitorsenergy storage performancelead‐free ceramicspolarization characteristicthermal stability

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Area of Science:

  • Materials Science
  • Energy Storage
  • Dielectric Materials

Background:

  • Dielectric capacitors are crucial for advanced electronics, but achieving high energy density and efficiency in simple, eco-friendly materials is challenging.
  • Current materials often struggle with thermal stability and efficiency trade-offs.

Purpose of the Study:

  • To develop high-efficiency and thermally stable dielectric materials for capacitive energy storage.
  • To explore strontium titanate-based ceramics with enhanced performance using machine learning and structural engineering.

Main Methods:

  • Utilized machine learning to guide material design.
  • Employed synergistic local structural engineering and optimized fabrication processes.
  • Incorporated Bi3+ ions into strontium titanate to induce structural distortions and polar clusters.

Main Results:

  • Achieved ultrahigh energy density (10.69 J cm⁻³) with near-ideal efficiency (∼97%) and a record figure of merit (392 J cm⁻³) at room temperature.
  • Maintained high performance at 150°C (figure of merit 152 J cm⁻³, efficiency ∼94%).
  • Demonstrated enhanced polarization, reduced hysteresis loss, and improved breakdown strength.

Conclusions:

  • Developed a compositionally simple, environmentally benign pathway for superior dielectric energy storage.
  • The Bi3+-doped strontium titanate ceramics offer excellent thermal stability and energy storage capabilities.
  • These findings pave the way for high-performance capacitive energy storage systems.