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Related Concept Videos

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...
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...
Capacitors and Capacitance01:18

Capacitors and Capacitance

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...
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 Capacitor01:12

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.

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Related Experiment Video

Updated: May 21, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

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

Published on: January 7, 2022

Supercapacitors based on high-quality graphene scrolls.

Fanyan Zeng1, Yafei Kuang, Gaoqin Liu

  • 1State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha, China.

Nanoscale
|June 9, 2012
PubMed
Summary

High-quality graphene scrolls (GSS) offer a 50% capacity increase for supercapacitors. This novel scrolled structure provides enhanced performance and excellent long-term stability, making GSS a promising material for energy storage applications.

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Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors
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Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

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Last Updated: May 21, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
12:00

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

Published on: January 7, 2022

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors
10:57

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

Published on: November 30, 2021

Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Graphene sheets (GS) are widely studied for energy storage due to their unique properties.
  • Improving the capacitance and stability of graphene-based materials remains a key challenge for supercapacitor development.

Purpose of the Study:

  • To design and synthesize high-quality graphene scrolls (GSS) with a unique scrolled topography.
  • To investigate the capacitance properties and long-term cycling stability of GSS for supercapacitor applications.

Main Methods:

  • Microexplosion method for GSS synthesis.
  • Cyclic voltammetry, galvanostatic charge-discharge, and electrical impedance spectroscopy for capacitance characterization.
  • Evaluation of cycling stability over 1000 cycles.

Main Results:

  • Graphene scrolls (GSS) exhibited a remarkable specific capacity of 162.2 F g(-1) at 1.0 A g(-1) in 6 M KOH, a ~50% increase compared to graphene sheets (110 F g(-1)).
  • The enhanced performance is attributed to the unique scrolled topography of GSS.
  • GSS demonstrated excellent long-term cycling stability, retaining 96.8% of their capacity after 1000 cycles at 1.0 A g(-1).

Conclusions:

  • The topological structure of graphene sheets significantly impacts their capacitance properties.
  • Graphene scrolls (GSS) represent a promising material for advanced supercapacitor applications due to their superior capacity and stability.
  • The microexplosion method is an effective technique for producing high-performance graphene-based materials for energy storage.