具有内在微孔性的电活性离子聚合物,用于高性能电容储能
A M Mahmudul Hasan1, Saptasree Bose2, Rupam Roy1
1Department of Chemistry, Butler Polymer Research Laboratory, University of Florida, Gainesville, FL, 32611, USA.
Advanced materials (Deerfield Beach, Fla.)
|June 8, 2024
概括
本质微性的离子聚合物 (PIM) 提供了没有添加剂的高性能超级电容电极. 它们独特的结构使其能够快速获得离子,从而产生出色的能量和功率密度,并具有长期稳定性.
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
- 聚合物科学 聚合物科学
背景情况:
- 超级电容器需要高效的电极材料来储存能量.
- 传统电极通常依赖导电添加剂和粘合剂,这可能会限制性能.
- 本质微性聚合物 (PIMs) 为先进的应用提供独特的结构性质.
研究的目的:
- 报告一种具有内在微性的离子聚合物 (PIM) 作为高功能的超级电容电极.
- 研究孔隙性和离子可访问性在PIM电化学性能中的作用.
- 为了证明PIM作为独立的超级电容电极的潜力,没有添加剂.
主要方法:
- 孔隙和无孔隙的紫外线PIMs的合成和特征.
- 在H2SO4和Na2SO4电解质中作为超级电容电极的PIM的电化学测试.
- 评估长期循环稳定性和两电极装置的性能.
主要成果:
- 多孔的离子PIM显示出高的伪电容能量 (315Fg-1在H2SO4) 和电容能量密度 (250Fg-1在Na2SO4).
- 性能归因于PIM结构内的可访问的表面积大和快速的离子传输.
- 该材料在没有导电添加剂或结合剂的情况下表现出极好的循环稳定性 (>10,000个循环).
- 一个对称超级电容的原型显示了高库伦比克效率 (>99%) 和最小的容量衰减 (<10 mF超过2000个周期).
结论:
- 离子PIM有效地作为独立的超级电容电极起作用,消除了对添加剂的需求.
- PIM的内在微性和离子性质是它们高电化学性能的关键.
- 离子PIM显示出其他电化学应用的前景,包括传感器,离子分离膜和显示器.
相关概念视频
MOS Capacitor
765
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
765
Dielectric 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
Energy Stored in Capacitors
481
A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
481
Energy Stored in a Capacitor
3.6K
When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
3.6K


