在无水离子系统中增强质子导电性的分子起源
Zaneta Wojnarowska1, Krzysztof J Paluch, Evgeni Shoifet
1Institute of Physics, University of Silesia , Uniwersytecka 4, 40-007 Katowice, Poland.
Journal of the American Chemical Society
|January 7, 2015
概括
合成和研究了新的质子导体材料. 阴子结构内的内部质子跳跃显著影响电荷载体的移动性,为燃料电池和电池中的无水电解质提供了新的设计策略.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 物理化学 物理化学
背景情况:
- 离子系统中的质子导电性对于燃料电池和电池至关重要.
- 由于缺乏对无水条件下的质子跳跃的理解,因此商业应用受到阻碍.
研究的目的:
- 研究控制新无水材料中质子跳跃的因素.
- 探索离子结构和质子导电性之间的关系.
- 为设计先进的质子导体提供洞察力.
主要方法:
- 通过利多卡因基与酸的反应合成新型质子导体材料.
- 在环境和高压下对导电性的实验测量.
- 密度函数理论 (DFT) 计算以建模质子的移动性.
主要成果:
- 鉴定了合成盐之间的导电性质的根本差异.
- DFT的计算揭示了子内部的质子跳跃会影响电荷载体路径.
- 建立了离子结构和质子流动性之间的联系.
结论:
- 内部质子跳跃是无水质子导电性的关键因素.
- 这些发现为原始离子玻璃中格罗图斯型机制提供了新的视角.
- 提出了设计高性能无水质质子导体材料的新策略.
更多相关视频
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
6.1K
05:33Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
22.5K
相关概念视频
Theory of Strong Electrolytes
114
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...
114
Aqueous Solutions and Heats of Hydration
19.1K
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...
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...
19.1K
Ionic Association
202
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.
202
Intermolecular Forces
79.2K
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...
79.2K
Molecular and Ionic Solids
21.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
21.1K
Ionic Strength: Effects on Chemical Equilibria
3.1K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
3.1K
