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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Updated: Jun 28, 2025

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

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Structural disorder determines capacitance in nanoporous carbons.

Xinyu Liu1, Dongxun Lyu1, Céline Merlet2,3

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.

Science (New York, N.Y.)
|April 18, 2024
PubMed
Summary
This summary is machine-generated.

Structural disorder, not pore size, enhances supercapacitor performance. More disordered nanoporous carbons with smaller graphene domains exhibit higher capacitance due to efficient ion storage, guiding the design of energy-dense devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Supercapacitors are crucial energy storage devices, but their performance is limited by electrode material characterization.
  • Nanoporous carbon electrodes are widely used, yet clear design principles for enhancing capacitance are lacking.
  • Pore size has been traditionally viewed as the primary factor influencing capacitance.

Purpose of the Study:

  • To investigate the relationship between the structural characteristics of nanoporous carbons and their capacitance.
  • To identify key design principles for improving supercapacitor energy density.
  • To challenge the conventional focus on pore size as the sole determinant of capacitance.

Main Methods:

  • Evaluation of a diverse range of commercial nanoporous carbon materials.
  • Nuclear magnetic resonance (NMR) spectroscopy for structural analysis.
  • Computational simulations to model ion storage mechanisms.

Main Results:

  • No significant correlation was found between pore size and capacitance in the evaluated carbons.
  • A strong positive correlation exists between structural disorder and capacitance.
  • Disordered carbons with smaller graphene-like domains demonstrated superior ion storage and higher capacitance.

Conclusions:

  • Structural disorder is a more critical factor than pore size for enhancing supercapacitor capacitance.
  • Exploiting and controlling structural disorder in nanoporous carbons can lead to highly energy-dense supercapacitors.
  • This study provides new insights for designing advanced electrode materials for energy storage applications.