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Related Concept Videos

Capacitors and Capacitance01:18

Capacitors and Capacitance

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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...
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MOS Capacitor01:25

MOS Capacitor

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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...
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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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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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Energy Stored in a Capacitor01:12

Energy Stored in a Capacitor

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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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Equivalent Capacitance01:19

Equivalent Capacitance

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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Quantum Capacitance of Two-Dimensional-Material-Based Supercapacitor Electrodes.

Subrata Ghosh1, Sushant K Behera2, Ashutosh Mishra3

  • 1Micro and Nanostructured Materials Laboratory (NanoLab), Department of Energy, Politecnico de Milano, Via Ponzio 34/3, Milano 20133, Italy.

Energy & Fuels : an American Chemical Society Journal
|December 14, 2023
PubMed
Summary
This summary is machine-generated.

Quantum capacitance (Cq) significantly boosts supercapacitor performance beyond electric double-layer and redox mechanisms. This review explores Cq

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Electrochemical energy storage is key to replacing fossil fuels and reducing pollution.
  • Supercapacitors are vital for high-power applications, with ongoing research for high-energy storage.
  • Understanding charge storage mechanisms in supercapacitor electrodes is crucial for performance.

Purpose of the Study:

  • To explore the origin and contribution of quantum capacitance (Cq) to supercapacitor performance.
  • To discuss strategies for enhancing Cq in electrode materials.
  • To review the current state of Cq in various electrode materials and its theoretical and experimental quantification.

Main Methods:

  • Literature review and critical analysis of theoretical studies on quantum capacitance.
  • Summary of experimental measurements of quantum capacitance using electrochemical techniques.
  • Examination of supercapacitor design strategies based on electrode materials and electrolytes.

Main Results:

  • Quantum capacitance (Cq) is a significant charge storage mechanism in supercapacitors, alongside electric double-layer and surface redox reactions.
  • Various electrode materials, including carbon, 2D materials, and composites, exhibit varying Cq contributions.
  • Theoretical studies dominate Cq quantification, with some experimental validation available.

Conclusions:

  • Quantum capacitance plays a critical role in advancing supercapacitor energy storage capabilities.
  • Optimizing electrode materials and electrolytes is essential for maximizing Cq and overall device performance.
  • Insights into Cq are transferable to other energy storage technologies like batteries and metal-ion capacitors.