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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...

Overview of Functional Groups

Overview of Functional Groups

Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, certain functional groups will make a molecule hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each functional group is a unique...

Introduction to Functional Groups

Introduction to Functional Groups

Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of common functional groups
The table below summarizes some of the major functional groups in organic chemistry....

Capacitors and Capacitance

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...

Overview of Advanced Functional Groups

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.

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.

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

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

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Effects of Oxygen-Containing Functional Groups on Supercapacitor Performance.

Sebastien Kerisit¹, Birgit Schwenzer¹, M Vijayakumar¹

¹Physical Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99352 United States.

The Journal of Physical Chemistry Letters

|August 18, 2015

Summary

Molecular dynamics simulations reveal how graphene defects impact supercapacitor performance. Hydroxyl groups on graphene surfaces reduce integral capacitance by disrupting ionic liquid interactions.

Keywords:

graphene graphene oxide interface ionic liquids molecular dynamics

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Area of Science:

Materials Science
Electrochemistry
Computational Chemistry

Background:

Graphene-based supercapacitors offer high performance.
Understanding electrode-electrolyte interfaces is crucial for optimizing energy storage.
Oxygen-containing defects on graphene surfaces can influence electrochemical properties.

Purpose of the Study:

To investigate the molecular-level effects of oxygen-containing defects on graphene surfaces.
To determine the impact of these defects on the integral capacitance of graphene-based supercapacitors.
To elucidate the relationship between interfacial structure and capacitance.

Main Methods:

Molecular dynamics (MD) simulations were employed.
Simulations focused on the interface between graphene and the ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIM OTf).
Analysis of interfacial structure, ion mobility, and hydrogen bonding was performed.

Main Results:

Increased surface coverage of hydroxyl groups on graphene negatively affects integral capacitance.
Epoxy groups have a less significant impact on capacitance compared to hydroxyl groups.
Hydrogen bonding between hydroxyl groups and SO3 moieties hinders ion interaction and reduces interfacial permittivity.

Conclusions:

Graphene surface defects, particularly hydroxyl groups, play a critical role in supercapacitor performance.
The findings provide molecular insights into capacitance variations.
This research can guide the rational design of advanced electrode materials for supercapacitors.