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Related Concept Videos

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.
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Capacitor With A Dielectric01:18

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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.
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Updated: Jul 21, 2025

Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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Natural Solid-State Hydrogel Electrolytes Based on 3D Pure Cotton/Graphene for Supercapacitor Application.

Nujud Badawi Mohammed1,2, Khalid Mujasam Batoo3, Sajjad Hussain4,5

  • 1Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia.

Micromachines
|July 29, 2023
PubMed
Summary

Researchers developed a flexible, solid-state hydrogel electrolyte using cotton and graphene for advanced supercapacitors. This material enhances ionic conductivity and specific capacitance, paving the way for next-generation energy storage devices.

Keywords:
conductivitycottonenergygraphenesupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state electrolytes are crucial for safer and more flexible energy storage devices.
  • Traditional electrolytes face challenges in achieving high ionic conductivity and mechanical stability.
  • Graphene integration offers potential for enhanced electrochemical performance.

Purpose of the Study:

  • To develop a novel solid-state hydrogel electrolyte based on 3D pure cotton and graphene.
  • To investigate the impact of graphene on the ionic conductivity and electrochemical properties of the hydrogel.
  • To assess the potential of this composite material for next-generation supercapacitors.

Main Methods:

  • Fabrication of a composite hydrogel electrolyte using 3D cotton and graphene.
  • Measurement of ionic conductivity at 25 °C.
  • Electrochemical characterization using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests.
  • Evaluation of electrochemical stability.

Main Results:

  • The ionic conductivity of the cotton/graphene hydrogel reached 13.9 × 10⁻³ S/cm at 25 °C.
  • A specific capacitance of 327 F/g was achieved at 3 mV/s (CV).
  • A peak specific capacitance of 385.4 F/g was observed at 100 mA/g (GCD).
  • The composite hydrogel demonstrated excellent electrical stability.

Conclusions:

  • The cotton/graphene hydrogel electrolyte offers a promising pathway for high-performance, flexible supercapacitors.
  • Graphene significantly enhances ionic conductivity by facilitating charge carrier transport.
  • This material is suitable for the design of advanced, next-generation supercapacitors.