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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

771
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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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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Capacitors01:15

Capacitors

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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...
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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 Capacitors01:10

Energy Stored in Capacitors

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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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Equivalent Capacitance01:19

Equivalent Capacitance

334
From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Binder-free all-carbon composite supercapacitors.

Sabreen Jarrar1, Shahzad Hussain2, Atta Ul Haq2

  • 1Department of Physics, An-Najah National University, PO Box 7, Nablus, West Bank, Palestine †.

Nanotechnology
|April 23, 2024
PubMed
Summary
This summary is machine-generated.

Binder-free carbon nanofiber and graphene nanoplatelet composites offer lightweight, high-performance electrodes for supercapacitors. This all-carbon material enhances specific capacitance and energy density for advanced energy storage applications.

Keywords:
binder-freecarbon nanofibersenergy storagegraphene nanoplateletsnanocompositesupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Traditional supercapacitors use polymeric binders, adding weight and increasing resistance.
  • Developing lightweight, binder-free electrodes is crucial for next-generation energy devices.

Purpose of the Study:

  • To fabricate and characterize binder-free, all-carbon composite electrodes using carbon nanofibers (CNFs) and graphene nanoplatelets (GNPs).
  • To investigate the effect of varying GNP concentrations on the structural, morphological, and electrochemical properties of the composite electrodes.

Main Methods:

  • Powder processing of CNFs and GNPs to create hybrid composite materials.
  • Structural, morphological, and electrochemical property analysis at different GNP concentrations.
  • Electrochemical testing in 1 M and 6 M potassium hydroxide (KOH) electrolytes.

Main Results:

  • Specific capacitance (Cs) increased with GNP concentration, reaching 120 F g⁻¹ at 90 wt% GNPs (5-fold increase over pristine CNFs).
  • Maximum Cs reached 189 F g⁻¹ in 6 M KOH electrolyte.
  • A maximum energy density of ~20 Wh kg⁻¹ and power density of 340 W kg⁻¹ were achieved with 90 wt% GNPs.

Conclusions:

  • The synergistic effect between CNFs and GNPs, along with conductive networks, enhances electrochemical performance.
  • Binder-free all-carbon electrodes demonstrate significant potential for advanced energy storage applications.
  • This composite material offers a promising alternative for lightweight, high-performance supercapacitors.