稳定的离子和离子交换膜
Qihang Zhang1,2, Rong Ren1,2, Liqiang Yin1,2
1Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University 600 Dunyu Road, Hangzhou, 310030, Zhejiang Province, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|February 17, 2025
概括
开发稳定的阴离子组是改善能量设备的离子交换膜 (AEM) 的关键. 这项研究的重点是循环阴阳基组,以提高AEM的耐用性和设备的寿命.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 阳离子交换膜 (AEM) 对于具有成本效益的能量转换和储存设备至关重要,在性催化中具有优势.
- 尽管离子导电性和机械性能取得了进展,但AEM的耐用性,特别是抗氧化攻击的耐用性,限制了广泛采用.
- 在AEM中增强阴离子组的稳定性对于提高设备寿命至关重要.
研究的目的:
- 系统地审查最近在AEMs开发和稳定性增强的基组的进展.
- 突出新出现的循环阴阳基团在提高AEM性能方面的潜力.
- 分析小分子和AEM中的子之间的稳定性差异,指导未来的研究.
主要方法:
- 文学综述和对AEMs的cationic组开发的概念分析.
- 对各种阴离子结构的稳定性特征进行比较讨论.
- 探索影响AEM持久性的结构-财产关系.
主要成果:
- 氧化离子对阳离子的攻击是AEMs的主要降解途径.
- 与传统结构相比,周期性基基团显示出增强性稳定的前景.
- 了解不同环境中的离子行为对于设计强大的AEM至关重要.
结论:
- 开发内在稳定的阴离子组,特别是循环的,对于推进AEM技术至关重要.
- 需要进一步研究阴离子设计和AEM制造,以克服耐用性限制.
- 稳定的AEM对于下一代储能和转换系统的商业可行性至关重要.
相关概念视频
01:17Ion Exchange
529
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...
529
01:15Potentiometry: Membrane Electrodes
406
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
406
00:42Ionic Bonds
117.7K
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...
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...
117.7K
02:54Ions as Acids and Bases
23.2K
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:
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:
23.2K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
319
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
319
01:17Pore Transport and Ion-Pair Transport
332
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
332