聚乙烯 (聚乙烯) 用于阳离子交换膜
Huanhuan Chen1, Ki-Taek Bang1, Ye Tian1
1Department of Chemical and Biological Engineering, The Hong Kong, University of Science and Technology Clear Water Bay, Kowloon, Hong Kong SAR, China.
Angewandte Chemie (International ed. in English)
|July 31, 2023
概括
研究人员开发了一种新的piperidinium聚合物用于燃料电池中的离子交换膜 (AEM). 这种材料具有高的氧导电性和改善的机械/化学稳定性,克服了AEM燃料电池开发中的关键挑战.
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
- 聚合物化学 聚合物化学
背景情况:
- 阳离子交换膜 (AEM) 对于高性能燃料电池至关重要.
- 目前的AEM面临着平衡高氧化物导电性与机械和化学稳定性的挑战.
- 提高一种性能往往会影响另一种性能,阻碍燃料电池的发展.
研究的目的:
- 为AEM燃料电池应用设计和合成一种新的piperidinium聚合物.
- 为了提高氧化物导电性和AEM的稳定性.
- 解决现有膜技术中导电性和耐久性之间的权衡问题.
主要方法:
- 简单的,高产量的化学合成,用聚乙烯骨干的 piperidinium 聚合物.
- 引入离子交叉连接到高阴离子比率的AEM中.
- 氧化物导电性,吸水,膨胀和性稳定性的表征.
主要成果:
- 合成的聚合物PEP80-20PS在80°C时实现了354.3mS/cm的氧导电性.
- 与基础聚合物PEP80.0相比,离子交联显著降低了吸水量 (降低了69%) 和胀 (降低了85%).
- PEP80-20PS表现出极好的性稳定性,在KOH中35天后保持84.7%的完整性.
结论:
- 开发的 piperidinium 聚合物为创建高度稳定和导电的 AEM 提供了一个有前途的解决方案.
- 离子交联是一种有效的策略,可以抑制水吸收和胀,同时提高导电性.
- 这一进步是迈向实用,高性能AEM燃料电池的重要一步.
相关概念视频
01:17Ion Exchange
622
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...
622
01:15Potentiometry: Membrane Electrodes
632
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...
632
01:09Ion-Exchange Chromatography
584
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
584
01:17Pore Transport and Ion-Pair Transport
515
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...
515