Electrical impedance spectroscopy of ionic liquid 1-ethyl-3-methylimidazolium methanesulfonate (ECOENG™ 110)

Double Layer at [BuMeIm][Tf2N] Ionic Liquid–Pt or −C Material Interfaces

“…However, the different and recent above-mentioned theoretical approaches came to a sufficient degree of refinement so that a comparison with experimental works is now wholly justified. Experimental works in this field are mainly based on double-layer capacitance measurements (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41) deduced from either electrochemical impedance spectroscopy (EIS) or ac voltammetry and spectroscopic or surface analysis measurements (SFG, surface Raman, or SERS on Ag, SECM, STM/AFM) (42)(43)(44)(45)(46)(47)(48) occasionally coupled to electrochemical measurements. If one only considers double-layer capacitance data, there are still debates on the dependence of the capacitance with potential and with temperature on the role of the substrate (metallic or nonmetallic) and on the role of an equivalent of the Helmholtz layer in aqueous solvents which obviously cannot be present with the same characteristics in ILs.…”

“…The structure of the double layer of ionic liquids (ILs) contacting different electrode materials has recently given rise to a huge number of both theoretical − and experimental works. − The knowledge of its characteristics which condition in a dramatic way electron transfer is obviously of paramount interest in the development of the manifold applications which are listed in an exhaustive manner in recent reviews. − Among those applications, the knowledge of the properties and characteristics of the double layer of ILs, and concurrently their wide potential window within which the material behaves as a quasi ideally polarizable electrode, is of primary interest in the use of ILs in supercapacitors. , Facing the abundant literature of experimental works, the theoretical approaches between the three systems, aqueous solutions, molten salts, and ionic liquids, are totally unbalanced: there are in fact no unambiguously accepted theories for both molten salts and ILs at the present time that compare with the well-established Gouy–Chapman–Stern (GCS) theory for aqueous solvents. However, the different and recent above-mentioned theoretical approaches came to a sufficient degree of refinement so that a comparison with experimental works is now wholly justified.…”

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

“…Shape, size and materials for the electrodes are intrinsic factors to determine the performance of the EDLCs. For instance, porous carbon nanotubes and non-porous glassy carbon 17) for electrodes were characterized by the EIS as well as conventional metallic electrodes (Pt, Cu, Ag, and Mo) 18) . 26) .…”

Synthesis, characterization and study of electrochemical applicability of novel asymmetrically substituted 1,3-dialkyl-1,2,3-benzotriazolium salts for supercapacitor fabrication

“…5) show a semicircular region in the low-frequency region. This is indicative of bulk electrolyte resistance due to ionic liquid and charge transfer or polarization resistance [49][50][51] (equivalent circuit values for different liquids are given in Table S2 †). We calculated the conductance of every ionic liquid from resistance, which is given in ESI (Table S2 †).…”