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首页> 外文期刊>Electroanalysis >Ion Transfer Voltammetry Associated with Two Polarizable Interfaces Within Water and Moderately Hydrophobic Ionic Liquid Systems
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Ion Transfer Voltammetry Associated with Two Polarizable Interfaces Within Water and Moderately Hydrophobic Ionic Liquid Systems

机译：离子转移伏安法与水和中度疏水离子液体系统中的两个极化界面相关

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摘要

An electrochemical system composed of two polarizable interfaces (the metallic electrode|water and water|ionic liquid interfaces), namely two-polarized-interface (TPI) technique, has been proposed to explore the ion transfer processes between water and moderately hydrophobic ionic liquids (W|mIL), typically 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C_8mimC_1C_1N) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C_6mimC_1C_1N). Within the classic four-electrode system, it is not likely that the ion transfer information at the W|mIL interface can be obtained due to an extremely narrow polarized potential window (ppw) caused by these moderately hydrophobic ionic components. In this article, we show that TPI technique has virtually eliminated the ppw limitation based on a controlling step of concentration polarization at the electrode|water interface. With the aid of this technique, the formal ion transfer potential differences between C_1C_1N~- and C_nmim~+ (n=6, 8) were accurately determined for 356mV and 420mV at a corresponding interface (W|C_6mimC_1C_1N and W|C8mimC_1C_1N). Besides, this technique is used to monitor electrochemical polarization at the two W|mIL systems, which exhibits an adaptable polarizability (i.e., a conversion from a nonpolarized interface to a polarized interface). Some of the typical anion transfers at the W|C_8mimC_1C_1N interface have also been investigated, as they are particularly important for ion extraction. The experimental results indicate that this facile TPI technique offers a general avenue to explore ion transfer in multifarious biphasic systems.
机译：为了探索水与中度疏水性离子液体之间的离子转移过程，提出了一种由两个极化界面（金属电极和水离子液体界面）组成的电化学体系，即两极化界面（TPI）技术。 W | mIL），通常为1-辛基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（C_8mimC_1C_1N）和1-己基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（C_6mimC_1C_1N）。在传统的四电极系统中，由于这些中等疏水性离子组分导致的极窄的极化电势窗口（ppw），不可能获得W | mIL界面的离子转移信息。在本文中，我们表明TPI技术实际上消除了基于电极界面处浓度极化控制步骤的ppw限制。借助该技术，可以在相应的界面（W | C_6mimC_1C_1N和W | C8mimC_1C_1N）上准确确定356mV和420mV的C_1C_1N〜-和C_nmim〜+之间的形式离子转移电势差（n = 6，8）。此外，该技术用于监测两个W | mIL系统的电化学极化，该极化表现出可适应的极化率（即，从非极化界面到极化界面的转换）。还已经研究了W | C_8mimC_1C_1N界面处的一些典型阴离子转移，因为它们对于离子提取特别重要。实验结果表明，这种简便的TPI技术为探索多种双相系统中的离子转移提供了一般途径。

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