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Related Concept Videos

Equivalent Capacitance01:19

Equivalent Capacitance

1.8K
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.
The following strategies are adopted to calculate...
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Equivalent Capacitance01:19

Equivalent Capacitance

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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...
479
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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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.
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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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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

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Imperceptible Supercapacitors with High Area-Specific Capacitance.

Jin Ge1, Minshen Zhu1, Eric Eisner1

  • 1Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069, Dresden, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|May 12, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed ultra-thin supercapacitors using reduced graphene oxide/polyaniline electrodes and a novel gel electrolyte. These imperceptible energy storage devices achieve high capacitance, paving the way for flexible, self-powered electronics in healthcare.

Keywords:
grapheneimperceptible electronicspolyanilineultraflexible supercapacitorsultrathin gel electrolytes

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Energy Storage

Background:

  • Imperceptible electronics require miniaturized components, but energy storage devices face challenges with reduced thickness impacting energy density.
  • Existing energy storage solutions are not optimized for the extreme thinness required for next-generation biomedical and healthcare systems.

Purpose of the Study:

  • To develop imperceptible supercapacitors with high area-specific capacitance and minimal thickness for flexible electronics.
  • To investigate the use of reduced graphene oxide/polyaniline composite electrodes and a specialized gel electrolyte.

Main Methods:

  • Fabrication of reduced graphene oxide/polyaniline (RGO/PANI) composite electrodes and polyvinyl alcohol (PVA)/H2SO4 gel electrolyte.
  • Mechanical compression of electrodes to reduce void volume and optimize thickness.
  • Adjustment of PVA-to-H2SO4 mass ratio to enhance ion conductivity.

Main Results:

  • Achieved a 5 µm total device thickness with an area-specific capacitance of 36 mF cm⁻².
  • Reduced electrode thickness by 83% while retaining 89% of capacitance through compression.
  • Improved ion conductivity by 5000% with a 1:4.5 PVA-to-H2SO4 ratio, enabling a 2 µm gel electrolyte.

Conclusions:

  • Developed high-performance, ultra-thin supercapacitors suitable for imperceptible electronics.
  • Demonstrated impressive electromechanical stability under bending and folding conditions.
  • These supercapacitors represent a significant advancement for self-powered, imperceptible systems in healthcare and beyond.