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Related Concept Videos

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Metallic Solids

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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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MOS Capacitor01:25

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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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Network Covalent Solids02:18

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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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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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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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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Scanning-probe Single-electron Capacitance Spectroscopy
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Interlayer Confined Capacitive Response via Solvated Cointercalation in Graphite Layers.

Xiaojuan Huang1, Yi-Fan Cheng2, Huan Liu3

  • 1Department of Materials Science and Engineering, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, Xiamen Key Laboratory of High Performance Metals and Materials, College of Materials, Xiamen University, Xiamen 361005, China.

ACS Nano
|February 11, 2025
PubMed
Summary
This summary is machine-generated.

Confined nanofluids in 2D materials boost ionic flux for high-capacity energy storage. This study reveals interlayer-confined electric double-layer (EDL) behavior in graphite using Na+-diglyme cointercalation, enabling ultrahigh-rate capacitor performance.

Keywords:
EQCMcapacitancecointercalationin situ NMRinterlayer confinement

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Nanofluids confined in 2D materials enhance ionic flux, crucial for advanced energy storage.
  • Electric double-layer (EDL) capacitive behavior is key for ultrahigh-rate capacitor applications.

Purpose of the Study:

  • To provide quantitative and microscopic insights into interlayer-confined EDL capacitive behavior.
  • To investigate the cointercalation of sodium ions (Na+) and diglyme (G2) into graphite layers.
  • To understand the relationship between ion cointercalation, graphite structure evolution, and electrochemical performance.

Main Methods:

  • In situ nuclear magnetic resonance (NMR) spectroscopy.
  • Electrochemical quartz crystal microbalance (EQCM).
  • Embedded optical fiber sensors.

Main Results:

  • Demonstrated a nonconstant Na+:G2 ratio during cointercalation, correlating with graphite stage evolution (from >3 to 1).
  • Observed a transition from battery-like intercalation to interlayer-confined EDL adsorption.
  • Identified stage 1 graphite intercalation compounds (GICs) with expanded spacing (1.168 nm) facilitating mobile Na+ ions and G2 solvents for high-rate, stable performance.

Conclusions:

  • The study elucidates the microstructure and preconditions for confined solvated ions in layered materials exhibiting capacitor-like behavior.
  • Findings are critical for designing next-generation high-performance energy storage devices.
  • Understanding ion dynamics within confined spaces is essential for optimizing electrochemical responses.