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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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 basic...
Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...

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Related Experiment Video

Updated: May 28, 2026

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
10:40

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

Interlayer Engineering of Layered VOPO4 Through Organic Intercalation for Enhanced Potassium Storage Kinetics.

Xuyun Peng1, Shuang Fan1, Jingfeng Tai1

  • 1School of Sino-German Intelligent Manufacturing, Shenzhen City Polytechnic, Shenzhen 518100, China.

Micromachines
|May 27, 2026
PubMed
Summary

Researchers engineered nonaqueous potassium-ion batteries using phenylamine derivatives to expand interlayer spacing in VOPO4 nanosheets. This strategy enhances ion diffusion and stability, leading to superior energy storage performance.

Keywords:
VOPO4interlayer engineeringorganic-inorganic hybridphenylamine intercalationpotassium-ion battery

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

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Published on: May 23, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Nonaqueous potassium-ion batteries (KIBs) offer high energy density but face challenges due to potassium ion's large radius, causing structural degradation and slow kinetics.
  • Two-dimensional (2D) layered materials with open frameworks are crucial for improving ion diffusion pathways and structural stability in KIBs.

Purpose of the Study:

  • To develop a rational interlayer engineering strategy for 2D VOPO4 nanosheets using phenylamine derivatives to enhance potassium-ion storage performance.
  • To investigate the correlation between modulated interlayer spacing and electrochemical properties, optimizing electrode material design for KIBs.

Main Methods:

  • Intercalation of phenylamine derivatives (phenylamine, P-methylaniline, P-butylaniline) into layered 2D VOPO4 nanosheets to systematically expand interlayer spacing.
  • Characterization of structural changes and electrochemical performance (capacity, rate capability, cycling stability) of the modified VOPO4 electrodes.

Main Results:

  • Intercalation progressively expanded interlayer spacing from 0.76 nm to 1.58, 1.85, and 2.09 nm, maintaining framework integrity.
  • An optimal interlayer spacing of 1.85 nm demonstrated the best synergy between fast kinetics, high capacity (333.2 mAh g⁻¹ at 0.1 A g⁻¹), and structural stability.
  • The optimized electrode exhibited excellent rate capability (205.7 mAh g⁻¹ at 1 A g⁻¹) and remarkable cycling stability over 600 cycles.

Conclusions:

  • Phenylamine derivative-enabled interlayer regulation is an effective strategy for designing high-performance VOPO4-based electrode materials for KIBs.
  • Optimized interlayer spacing enhances K+ ion diffusion kinetics and potentially creates oxygen vacancies, improving overall electrochemical performance and stability.