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Capacitor With A Dielectric

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...

Energy Stored in Capacitors

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

Energy Stored in a Capacitor

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.

MOS Capacitor

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...

Dielectric Polarization in a Capacitor

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 a Capacitor: Problem Solving

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...

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Related Experiment Video

Updated: Jun 19, 2026

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

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

Published on: January 7, 2022

Piezoionic Interface Engineering Enabled High Energy Density and Suppressed Self-Discharge in Flexible

Xin Guo¹, Xidi Sun¹, Lulu Li¹

¹Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, China.

Small (Weinheim an Der Bergstrasse, Germany)

|June 17, 2026

Summary

Mechanical pressure enhances flexible supercapacitors by regulating ion transport. This piezoionic strategy boosts energy density and significantly slows self-discharge, improving performance for wearable electronics.

Keywords:

flexible supercapacitors piezoionic hydrogels self‐discharge wearable electronics

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Last Updated: Jun 19, 2026

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

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

Published on: January 7, 2022

Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Published on: March 17, 2023

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Self-discharge is a major limitation in flexible supercapacitors, particularly affecting energy storage and ion transport.
Interface engineering is crucial for managing charge loss without compromising performance.

Purpose of the Study:

To develop a piezoionic interface engineering strategy for flexible supercapacitors.
To utilize mechanical pressure to actively regulate interfacial ion transport and charge relaxation.

Main Methods:

A PVA-based hydrogel electrolyte with tunable piezoionic behavior was developed, guided by the Hofmeister effect.
Mechanical pressure was applied to induce ionic polarization and modulate interfacial properties.
Electrochemical performance, including energy density and self-discharge rate, was evaluated under varying pressure conditions.

Main Results:

Compression enhanced interfacial conformality, driving ions into micropores and forming a more compact electric double layer, increasing capacitance.
Induced polarization stabilized charge distribution, suppressed ion desorption, and slowed self-discharge.
The flexible supercapacitor achieved 112.4 µWh cm^-2 energy density and retained 90.1% energy after 1h, a 3.2-fold improvement over the unpressurized state.

Conclusions:

A pressure-regulated interfacial design paradigm was established for flexible supercapacitors.
This strategy simultaneously enhances energy density and charge retention.
The developed supercapacitor successfully powered a wireless wearable insole system, demonstrating practical application potential.