专业从事离子液体的合成、应用及其相关技术的研究工作----Lanzhou Greenchem ILs/青岛奥立科

题名

[Wiley数据库][2012]Ion Transfer Voltammetry Associated with Two Polarizable Interfaces Within Water and Moderately Hydrophobic ionic liquid Systems

参考引用方式

Shiyu Gan, Min Zhou, Jingdong Zhang, Lijie Zhong, Jens Ulstrup, Li Niu. Electroanalysis 2012, 24, 1–10

研究机构

中科院长春应用化学研究所

所涉及离子液体

1-辛基-3-甲基咪唑双（三氟甲烷磺酰）亚胺盐   862731-66-6

研究领域

水|离子液体体系中离子转移；TPI系统

论文摘要

An electrochemical system composed of two polarizable interfaces (the metallic electrodejwater and waterjionic liquid interfaces), namely two-polarized-interface (TPI) technique, has been proposed to explore the ion transfer processes between water and moderately hydrophobic ionic liquids(WjmIL), typically 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C8mimC1C1N) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C6mimC1C1N). Within the classic four-electrode system, it is not likely that the ion transfer information at the WjmIL 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 electrodejwater interface. With the aid of this technique, the formal ion transfer potential differences between C1C1N[1] and Cnmim+ (n=6, 8) were accurately determined for 356 mV and 420 mV at a corresponding interface (WjC6mimC1C1N and Wj C8mimC1C1N). Besides, this technique is used to monitor electrochemical polarization at the two WjmIL 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 WjC8mimC1C1N 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.

关键词

Ion transfer, Water|ionic liquid interfaces, Two-polarized-interface system