Kinetics of ion transfer at the ionic liquid/water nanointerface

Journal of the American Chemical Society
Yixian WangMichael V Mirkin

Abstract

Ion transfer (IT) processes in ionic liquids (ILs) are essential for their applications in electrochemical systems and chemical separations. In this Article, the first measurements of IT kinetics at the IL/water interface are reported. Steady-state voltammetry was performed at the nanometer-sized polarizable interface between water and ionic liquid, [THTDP(+)][C(4)C(4)N(-)], immiscible with it that was formed at the tip of a nanopipet. Kinetic measurements at such interfaces are extremely challenging because of slow mass-transfer rates in IL, which is ∼700 times more viscous than water. The recently developed new mode of nanopipet voltammetry, common ion voltammetry, was used to overcome technical difficulties and ensure the reliability of the extracted kinetic parameters of IT. The results suggest that the rate of interfacial IT depends strongly on solution viscosity. Voltammetric responses of nanopipets of different radii were analyzed to evaluate the effect of the electrical double layer at the liquid/liquid interface on IT kinetics. The possibility of the influence of the charged pipet wall on ion transport was investigated by comparing currents produced by cationic and anionic species. Possible effects of relaxation phenom...Continue Reading

References

Nov 26, 2004·Journal of the American Chemical Society·François O LaforgeMichael V Mirkin
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Citations

Oct 12, 2012·Analytical Chemistry·Hiroyuki OkamuraKojiro Shimojo
Dec 24, 2013·Electrochimica Acta·Shigeru AmemiyaRyoichi Ishimatsu
Dec 30, 2014·Analytica Chimica Acta·Huihui TianHua-Zhong Yu
Mar 21, 2015·Chemical Communications : Chem Comm·Justyna JedraszkoMarcin Opallo
Jun 13, 2018·Annual Review of Analytical Chemistry·Shudong ZhangYuanhua Shao
Oct 23, 2015·Angewandte Chemie·Eva Alvarez de EulateDamien W M Arrigan
Jul 26, 2012·Chemistry, an Asian Journal·Eva Alvarez de EulateDamien W M Arrigan

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