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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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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.9K
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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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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Updated: Aug 27, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Molecular Crowding Electrolytes for Stable Proton Batteries.

Sicheng Wu1, Junbo Chen1, Zhen Su1

  • 1School of Chemistry, Faculty of Science, University of New South Wales, Sydney, New South Wales, 2052, Australia.

Small (Weinheim an Der Bergstrasse, Germany)
|September 26, 2022
PubMed
Summary

Researchers developed a molecular crowding electrolyte using poly(ethylene glycol) (PEG) to enhance proton energy storage. This innovation improves stability and capacity by confining water molecules, paving the way for advanced post-lithium batteries.

Keywords:
MoO 3aqueous batterieselectrolytesproton batteries

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Area of Science:

  • Energy Storage
  • Electrochemistry
  • Materials Science

Background:

  • Proton electrochemistry offers high capacity and rate capability for post-lithium energy storage.
  • Traditional acid electrolytes face challenges with water co-intercalation, leading to electrode degradation and capacity fading.

Purpose of the Study:

  • To develop a stable and efficient proton storage system by mitigating the negative effects of water molecules in electrolytes.
  • To enhance the working potential window and cycling stability of electrode materials.

Main Methods:

  • Utilized poly(ethylene glycol) (PEG) as a molecular crowding agent in an aqueous electrolyte.
  • Employed spectroscopic characterizations (e.g., hydrogen bonding analysis) and molecular dynamics simulations to study water molecule activity.
  • Investigated anode material (MoO3) structural evolution using in-situ synchrotron X-ray diffraction (XRD).

Main Results:

  • Achieved fast and stable electrochemical proton storage with an expanded working potential window of 3.2 V.
  • Demonstrated that PEG forms hydrogen bonds with water, effectively confining its activity and reducing the free water fraction.
  • Observed a reversible multi-step proton intercalation mechanism in MoO3 anode, with PEG surficial adsorption enhancing cycling stability by preventing water desolvation damage.

Conclusions:

  • The molecular crowding electrolyte strategy effectively enhances proton energy storage performance and stability.
  • PEG additives offer a low-cost, eco-friendly solution for practical proton electrochemistry applications.
  • This approach addresses key limitations in current proton-based energy storage systems.