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Related Concept Videos

Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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Ion Exchange01:17

Ion Exchange

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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...
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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Electron Transfer in Microemulsion-Based Electrolytes.

Jing Peng1,2, Nelly M Cantillo2, K McKensie Nelms3

  • 1School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.

ACS Applied Materials & Interfaces
|August 19, 2020
PubMed
Summary

Researchers demonstrate microemulsions can enhance electrochemical reactions for renewable energy applications. This method improves charge transfer rates, crucial for efficient redox flow batteries and electrosynthesis.

Keywords:
cyclic voltammetryelectrochemistryelectrolytemicroemulsionredox flow battery

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Flowing electrochemical reactors are vital for renewable electricity integration and carbon-neutral processes.
  • Optimizing reactor efficiency requires balancing high solution conductivity and reagent solubility.
  • Current limitations hinder the widespread adoption of these technologies.

Purpose of the Study:

  • To investigate the use of microemulsions for enhancing electrochemical reaction rates.
  • To explore the potential of microemulsions in redox flow batteries and electrosynthesis.
  • To understand the mechanism controlling charge transfer in microemulsion-based electrochemical systems.

Main Methods:

  • An electrochemical reaction was conducted within a microemulsion system.
  • Electroactive material was loaded into the nonpolar (toluene) subphase of the microemulsion.
  • Charge transfer rates and exchange current density were measured.

Main Results:

  • A substantial rate of charge transfer was observed for the electrochemical reaction in the microemulsion.
  • The measured rate constant yielded an exchange current density comparable to that in redox flow batteries.
  • Surfactant presence controlled the reaction rate by managing reactant partitioning and interfacial ion proximity.

Conclusions:

  • Microemulsions can effectively enhance electrochemical reaction rates by separating conductive and reactive elements.
  • The findings suggest a mechanism similar to membrane-bound enzymatic reactions.
  • This approach opens avenues for broad application of microemulsions in controlled electrochemical processes.