在超级电容器模型中,对电双层特征和分子组合相互作用的对称效应在基于伊米达的离子液体电解质中
Michael Armstrong1,2,3, Natthiti Chiangraeng1,2, Monchai Jitvisate4,5
1Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand. piyarat.n@cmu.ac.th.
对称的伊米达离子液体表现出较慢的表面电荷发育和较低的电容在超级电容器由于离子吸附. 这限制了它们的响应能力与不对称的对应物相比.
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
- 计算化学的计算化学
背景情况:
- 了解电双层 (EDL) 特性对于推进基于离子液体的能量存储至关重要.
- 基于伊米达的离子液体被广泛研究,因为它们在超级电容器中的潜力.
研究的目的:
- 在模拟超级电容器中研究链对称性对伊米达二氧化 ((trifluoromethylsulfonyl) imide离子液体的EDL结构和充电动态的影响.
- 为了比较[C1mim][NTf2]和[C2mim][NTf2]在不同电压下的性能.
主要方法:
- 用分子动力学模拟来建模使用石墨电极的超级电容器.
- 分析的重点是充电动力学变化,EDL结构和不同应用于电压的差电容.
主要成果:
- 与[C2mim][NTf2]相比,[C1mim][NTf2]显示出更快的平衡,但表面电荷的发展速度较慢.
- [C1mim][NTf2]在正极上表现出一种刚性共离子层,具有持久的阴离子吸附.
- [C1mim][NTf2]表现出较低的响应能力,其特点是降低差异电容大小和在高电压下较不明显的电容翼.
结论:
- 在对称的离子液体中,[C1mim]+的强烈吸附阻碍了反应能力,并降低了整体电容.
- 链对称性显著影响EDL的形成和电化学性能在离子液体式超级电容器.
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