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Related Concept Videos

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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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
27.3K
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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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Ionic Association01:28

Ionic Association

165
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Electrolyte Structure Governs Formate Oxidation in Water-in-Salt Systems.

Katharina Trapp1, Soracha Kosasang1, Johannes Ingenmey2,3

  • 1Electrochemical Energy Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Zurich 8092, Switzerland.

Journal of the American Chemical Society
|March 19, 2026
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Summary
This summary is machine-generated.

Ion clustering in water-in-salt electrolytes limits reactant transport. Disrupting this clustering with specific anions enhances catalytic activity, but excessive disruption hinders performance by altering electrolyte structure.

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Area of Science:

  • Electrochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Water-in-salt electrolytes offer unique properties for electrochemical applications.
  • Understanding the interplay between electrolyte structure and catalytic activity is crucial for optimizing performance.

Purpose of the Study:

  • To investigate the influence of reactant concentration and electrolyte structure on catalytic activity.
  • To elucidate the mechanisms behind performance limitations and identify strategies for enhancement.

Main Methods:

  • Formate oxidation reaction on platinum (Pt) electrodes.
  • Molecular dynamics (MD) simulations and Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Scanning Electrochemical Microscopy (SEIRAS) for in-situ analysis.

Main Results:

  • Formate oxidation currents plateau at high concentrations due to formate ion clustering, reduced conductivity, and impeded transport.
  • Addition of chaotropic perchlorate anions disrupts clustering, increasing formate oxidation currents.
  • Excessive perchlorate disrupts the hydrogen-bonding network, hindering proton transport, causing local acidification, and promoting CO poisoning.

Conclusions:

  • Electrolyte bulk structure directly impacts catalytic activity at high reactant concentrations.
  • Controlling ion clustering and hydrogen-bonding networks is key to enhancing catalytic performance.
  • This study provides insights for designing advanced electrolytes for improved electrochemical processes.