Impedance Spectroscopic Study Using Nanoporous Electrode on Room Temperature Ionic Liquid-propanol Mixtures

Abstract

AC impedance spectroscopic approach is applied into room temperature ionic liquid (RTIL) based mixtures. an additive is required in order to achieve the low cost and quick electrochemical response for rapid charge/ discharge. Propanol having relative low vapor pressure among alcohols is adequate to reduce viscosity of the hydrophobic RTILs. With nanoporous metallic electrode, the EDL capacitance in the mixtures exceed that in the pure [C 2mim][TFSI]. Also, the capacitance in the mixtures was large enough up to 80 mol% propanol. In addition, isomer effect of propanol was seen in the AC impedance spectra.

Highly Efficient Electrohydrodynamic Pumping: Molecular Isomer Effect of Dielectric Liquids, and Surface States of Electrodes

“…38−40 For instance, n-propanol/i-propanol for additives can aid in distinct control of the electrochemical propertied of a molecular isomer. 40 Thus, we confirm that at the molecular level, highly efficient polarization pumping is also influenced by the isomer effect described by Δμ⃗ . Here, we extend the ideal model introduced in section 3.1 to the molecular isomer-driven EDL.…”

“…Molecular isomer effects have been observed in many molecular systems. − For instance, n -propanol/ i -propanol for additives can aid in distinct control of the electrochemical propertied of a molecular isomer . Thus, we confirm that at the molecular level, highly efficient polarization pumping is also influenced by the isomer effect described by Δ μ⃗ .…”

Direct Evidence of Confined Water in Room-Temperature Ionic Liquids by Complementary Use of Small-Angle X-ray and Neutron Scattering

“…Hydrogen bonding can control the water-mediated network at short-range order, medium-range order (MRO), and long-range order. Both the liquid structure as well as macroscopic properties of [DEME]-[BF 4 ]−water mixtures exhibit anomalous optical absorption in the UV−vis region 21 as well as anomalous density and thermal properties, 22 AC impedance properties, 23 and pH values. 24,25 Because of the mysterious hydrogen bonding of water in the RTILs, RTIL−water mixtures can possibly control protein structures.…”

Mid-Infrared Electrochromics Enabled by Intraband Modulation in Carbon Nanotube Networks

“…34,35 There are also characteristics of electrolysis (above 2 V and below −2 V) due to the device being run in an ambient environment. The electrolyzed species are most likely water, which narrows the potential window of ionic liquids and affects electrical properties, 36,37 and oxygen dissolved, which is stable in ionic liquids albeit with low diffusivity. 38 The effective temperature of a device at 100 °C shows a maximum of 57 °C at around −1 V and a minimum at +2 to 3 V. A hysteresis is noted, which could be due to degradation of the electrode under the higher potentials, and this is explored further in Figures S3 and S4.…”