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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Ion Exchange01:17

Ion Exchange

1.0K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.0K
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

552
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
552
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

85.5K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Hydrangea-Like CuS with Irreversible Amorphization Transition for High-Performance Sodium-Ion Storage.

Zu-Guang Yang1, Zhen-Guo Wu1, Wei-Bo Hua2

  • 1School of Chemical Engineering Sichuan University Chengdu 610065 P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 16, 2020
PubMed
Summary

Hydrangea-like copper sulfide (CuS) microspheres show enhanced sodium-ion storage. An irreversible amorphization process, not traditional reactions, drives performance, offering new electrode design principles.

Keywords:
hydrangea‐like CuSin situ synchrotron radiation diffractionirreversible amorphizationsodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal sulfides are promising for sodium-ion storage due to high capacity.
  • Reaction mechanisms and phase transformations in metal sulfides remain unclear.
  • The impact of nanostructure design on electrochemical performance is underexplored.

Purpose of the Study:

  • To investigate the sodium-ion storage mechanisms in metal sulfides.
  • To explore the role of nanostructure design in electrochemical behavior.
  • To elucidate the phase transformation pathways during sodium-ion insertion.

Main Methods:

  • Facile synthesis of hydrangea-like CuS microspheres.
  • In situ high-resolution synchrotron radiation diffraction analysis.
  • Transmission electron microscopy (TEM) and density functional theory (DFT) calculations.

Main Results:

  • CuS microspheres exhibit enhanced rate and cycle performance for sodium-ion storage.
  • An irreversible amorphization process, rather than intercalation or conversion, was identified.
  • Oriented crystal plane growth facilitated Na+ intercalation, and DFT supported the amorphous Cu-S cluster benefits.

Conclusions:

  • The study reveals a novel amorphization mechanism for sodium-ion storage in CuS.
  • Nanostructure design, specifically oriented crystal planes, enhances ion transport and storage.
  • Findings provide new insights into structure-property relationships and electrode material design principles.