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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...
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 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.
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...

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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

A nanostructured electrochromic supercapacitor.

Di Wei1, Maik R J Scherer, Chris Bower

  • 1Nokia Research Center, Broers Building, J. J. Thomson Avenue, CB3 0FA, Cambridge, United Kingdom. di.wei@nokia.com

Nano Letters
|March 7, 2012
PubMed
Summary
This summary is machine-generated.

Researchers created a novel vanadium pentoxide nanostructure for electrochromic supercapacitors. This ordered gyroid material offers high energy storage and a visible color change, indicating charge status.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Supercapacitors require advanced electrode materials for high energy and power density.
  • Electrochromic materials offer visual feedback for device status.

Purpose of the Study:

  • To develop and test an ordered bicontinuous double-gyroid vanadium pentoxide network for electrochromic supercapacitors.
  • To evaluate the electrochemical performance and electrochromic properties of the novel nanostructure.

Main Methods:

  • Fabrication of a freestanding vanadia network via electrodeposition into a block copolymer template.
  • Characterization of the double-gyroid morphology with 11.0 nm struts and high surface-to-volume ratio (161.4 μm(-1)).
  • Assembly and testing of supercapacitors using the gyroid-structured vanadia electrodes.

Main Results:

  • The vanadia gyroid network demonstrated suitability for fast lithium ion intercalation/extraction and surface reactions.
  • Supercapacitors achieved a specific capacitance of 155 F g(-1).
  • A distinct electrochromic color change from green/gray to yellow was observed, correlating with charge state.

Conclusions:

  • The ordered bicontinuous double-gyroid vanadia network is successfully applied in electrochromic supercapacitors.
  • This nanostructuring approach enhances electrochemical energy storage performance.
  • The concept is extendable to other electrochromic intercalation materials for energy storage applications.