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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.0K
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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Solubility Equilibria: Ionic Product of Water01:16

Solubility Equilibria: Ionic Product of Water

1.1K
Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le...
1.1K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

63.8K
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.
63.8K
Solvents01:12

Solvents

67.0K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
67.0K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
946
Intermolecular Forces03:13

Intermolecular Forces

61.0K
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...
61.0K

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玻璃中的水:一种自给自足的无机水性电解质

Sinorul Haque1,2, Indrajeet Mandal3, K Jayanthi4

  • 1CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata 700032, India.

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概括
此摘要是机器生成的。

研究人员从水玻璃中开发了一种新的固态电解质,用于水性可充电离子电池 (ARNIB). 这一突破显著扩大了电化学稳定性窗口,为更安全,更具成本效益的储能解决方案铺平了道路.

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科学领域:

  • 材料科学
  • 电化学
  • 能量储存

背景情况:

  • 可充电的水性离子电池 (ARNIB) 是大规模储能的安全和经济替代方案.
  • 传统的水性电解质具有1.23V的有限电化学稳定性窗口 (ESW),阻碍了ARNIB的性能.
  • 开发先进的电解质对于释放ARNIB技术的全部潜力至关重要.

研究的目的:

  • 使用廉价的无机玻璃开发一种新的固态电解质.
  • 显著提高水性电解质的电化学稳定性窗口.
  • 研究水玻璃材料的溶解机制.

主要方法:

  • 使用廉价无机材料水玻璃 (W-glass),制造固态,自支的水性膜电解质.
  • 描述了电化学性能,包括扩展ESW和离子导电性.
  • 使用神奇角度旋转的核磁共振 (NMR) 和溶液状态的NMR进行结构分析.

主要成果:

  • 开发了高达3.5V的ESW膜电解质.
  • 在室温下达到约10−4S/cm的离子导电性.
  • 确定了P-O-P链接的相互依赖性水解和Na+-H+离子交换作为W-玻璃溶解的驱动力.

结论:

  • 水玻璃是一种具有成本效益和可扩展的材料,用于制造ARNIB的先进固态电解质.
  • 这些电解质的增强ESW和导电性解决了当前ARNIB技术的关键局限性.
  • 这种方法为高性能水性可充电离子电池的商业采用提供了可行的途径.