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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...

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.

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...

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

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Published on: January 7, 2022

V₂O₅ encapsulated MWCNTs in 2D surface architecture: Complete solid-state bendable highly stabilized energy efficient

Bidhan Pandit¹, Deepak P Dubal², Pedro Gómez-Romero²

¹Nano Materials and Device Laboratory, Department of Physics, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur 440010, Maharashtra, India.

Scientific Reports

|March 4, 2017

Summary

Researchers developed a scalable method to create vanadium pentoxide (V2O5) on multi-walled carbon nanotubes (MWCNTs) for advanced energy storage. The resulting V2O5/MWCNTs electrodes show high performance and stability in flexible solid-state supercapacitors.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Developing high-performance energy storage materials is crucial for portable electronics and electric vehicles.
Carbon nanotubes offer excellent conductivity and surface area for electrode materials.
Vanadium pentoxide is a promising cathode material for supercapacitors due to its high theoretical capacity.

Purpose of the Study:

To develop a simple and scalable method for V2O5 encapsulation over MWCNTs.
To investigate the electrochemical properties of V2O5/MWCNTs electrodes.
To fabricate and evaluate flexible solid-state supercapacitors using V2O5/MWCNTs electrodes.

Main Methods:

Chemical bath deposition was used to synthesize V2O5/MWCNTs.
Electrochemical techniques, including charge-discharge cycling, were employed to assess performance.
A flexible symmetric supercapacitor (FSS-SSC) device was assembled and tested.

Main Results:

The V2O5/MWCNTs electrode demonstrated excellent charge-discharge capability and 93% cycling retention over 4000 cycles in a liquid electrolyte.
Electrochemical analysis revealed dual contributions (surface and diffusion-controlled) to the capacitive behavior.
The FSS-SSC device exhibited remarkable specific power and energy densities with enhanced cyclic stability compared to liquid configurations.

Conclusions:

The chemical bath deposition method provides a scalable route for V2O5/MWCNTs synthesis.
V2O5/MWCNTs are effective electrode materials for high-performance supercapacitors.
Flexible solid-state supercapacitors based on V2O5/MWCNTs offer a promising alternative for energy storage applications.