电刺激对 LiPF6 离子液体摩擦性能的影响

Xiangyu Ge, Xiaodong Wu, Qiuyu Shi, Yanfei Liu, He Liang
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摘要

这项工作研究了电压参数对基于 LiPF6 的离子液体(ILs)的摩擦和超润滑性能的影响。结果表明,电压的方向和大小对离子液体的摩擦性能有很大影响,在-0.1 V的电压刺激下可以实现宏观超润滑。表面分析和实验结果表明,电压大小通过决定球上形成的摩擦化学膜中的物质类型来影响摩擦系数(COF),而电压方向则通过影响 Li(PEG)+ 离子在球上的吸附行为来影响摩擦系数。在-0.1 V电压下,阳离子团Li(PEG)+吸附膜和含FeOOH的摩擦生化膜有助于降低摩擦。摩擦化学膜中 FexOy 的形成导致 -0.8 V 时摩擦力增加。Li(PEG)+ 离子的有限吸附和 FexOy 的形成导致 +0.1 V 时 COF 升高。这项研究证明,基于 LiPF6 的 IL 的摩擦性能可能受到电压参数的影响。我们提出了一个润滑模型,希望能为了解电环境下 IL 的润滑机理提供一个基础。
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Influence of Electrical Stimulation on the Friction Performance of LiPF6-Based Ionic Liquids
This work studied the influence of the voltage parameters on the friction and superlubricity performances of LiPF6-based ionic liquids (ILs). The results show that the voltage direction and magnitude greatly affected the friction performances of ILs and that macroscale superlubricity can be achieved with a stimulation of −0.1 V. The surface analysis and experiment results indicate that the voltage magnitude influences the coefficient of friction (COF) by determining the types of substances in the tribochemical film formed on the ball, while the voltage direction influences the COF by affecting the adsorption behavior of Li(PEG)+ ions on the ball. At −0.1 V, the cation group Li(PEG)+ adsorption film and FeOOH-containing tribochemical film contribute to friction reduction. The formation of FexOy within the tribochemical film results in an increase in friction at −0.8 V. The limited adsorption of Li(PEG)+ ions and the formation of FexOy contribute to the elevated COF at +0.1 V. This work proves that the friction performances of LiPF6-based ILs could be affected by voltage parameters. A lubrication model was proposed hoping to provide a basic understanding of the lubrication mechanisms of ILs in the electric environment.
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