The Inherent Capacitive Behavior of Imidazolium-based Room-Temperature Ionic Liquids at Carbon Paste Electrode
- 1 January 2005
- journal article
- Published by The Electrochemical Society in Electrochemical and Solid-State Letters
- Vol. 8 (7), J17-J19
- https://doi.org/10.1149/1.1922870
Abstract
Apparent capacitive characteristics of imidazolium-based room-temperature ionic liquids are justified by means of cyclic voltammetry and impedance techniques using the graphitic carbon paste electrode as a probe in virtue of its low substrate current. The morphological observation shows that the alternate intercalation of the cation and anion of the ionic liquids largely increases the specific surface areas. This outcome is consistent with the electrochemical results. The inherent capacitances are directly related to the special structures of imidazolium-based room-temperature ionic liquids at the interphase region. The formation of bulky ionic pairs owing to intramolecular hydrogen bonding interactions create a third charge layer between the electrode/electrolyte double-layer, which makes the interface rougher and hold more charges. Thus, a hypothesis of “quasi-ternary layers” distribution of charges at the interface is derived, which clarifies the capacitive behavior of the ionic liquids.Keywords
This publication has 34 references indexed in Scilit:
- A Room-Temperature Ionic-Liquid-Templated Proton-Conducting Gelatinous ElectrolyteThe Journal of Physical Chemistry B, 2004
- Electrochemical properties of novel ionic liquids for electric double layer capacitor applicationsElectrochimica Acta, 2004
- An in situ STM study on the long-range surface restructuring of Au(111) in a non-chloroaluminumated ionic liquidElectrochemistry Communications, 2003
- Surface Tension of the Restrictive Primitive Model for Ionic LiquidsPhysical Review Letters, 2003
- Physical and electrochemical properties of 1-alkyl-3-methylimidazolium tetrafluoroborate for electrolyteJournal of Fluorine Chemistry, 2003
- Liquid structure of 1, 3-dimethylimidazolium saltsJournal of Physics: Condensed Matter, 2002
- Capacitance and Pore-Size Distribution in Aqueous and Nonaqueous Electrolytes Using Various Activated Carbon ElectrodesJournal of the Electrochemical Society, 2001
- Room temperature ionic liquids of alkylimidazolium cations and fluoroanionsJournal of Fluorine Chemistry, 2000
- Three procedures of reversible dissolution/deposition of gold using halogen-containing organic systemsChemical Communications, 1997
- Hydrophobic, Highly Conductive Ambient-Temperature Molten SaltsInorganic Chemistry, 1996