在高性能超级电容器的多电解质水凝中,阳离子霍夫迈斯特效应调节的导电性
Qingqing Guo1, Huawei Su1, Xingxiang Ji1
1School of Chemistry and Chemical Engineering, State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences, Jinan, 250353, P. R. China.
Small methods
|July 8, 2024
概括
霍夫迈斯特效应影响了多电解质水凝的导电性,宇宙热带离子降低了导电性,而热带离子增加了导电性. 这项研究探讨了它对零度以下温度下的电化学特性和能量存储设备的影响.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
背景情况:
- 霍夫迈斯特效应描述了离子如何改变水溶液的特性.
- 多电解质水凝对离子环境敏感,影响其稳定性和可溶性.
- 了解离子特异效应对于设计先进材料至关重要.
研究的目的:
- 调查霍夫迈斯特效应对多电解质水凝的电化学特性.
- 为了在室内和零度以下的温度下探索这些效应.
- 为了评估聚二烯液凝在储能装置中的性能.
主要方法:
- 在不同度的氨盐中对聚电解质水凝进行系统研究.
- 在不同温度 (室内和零下) 上测量水凝导电性.
- 使用聚二电解质组装和循环运行超级电容器.
主要成果:
- 聚电解质水凝在低度盐中表现出抗聚电解质效应,在高度盐中表现出霍夫迈斯特效应.
- 宇宙离子降低导电性,而混乱离子由于差异相互作用而增加导电性.
- 聚二的水凝在杂热离子中表现出增强的导电性,在-40°C时达到6.2mS cm−1.
- 使用聚二电解质的超级电容器在-15,000个循环后在-40°C下保持了85%的电容保持率和~100%的库伦比效率.
结论:
- 霍夫迈斯特效应显著影响了多电解质水凝的导电性,特别是多晶.
- 离子类型和度是调节水凝导电性的关键因素.
- 这项研究提供了一种新的方法来提高在低温下运行的储能设备的性能.
相关概念视频
01:17Ion Exchange
573
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...
573
01:31Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K