Electrical Conductivity and Nyquist Plot of C4C1Im BF4 at Room Temperature by Impedance Spectroscopy

Abstract

Ionic liquids (ILs) represents a real alternative for electrochemical applications due to their remarkable characteristics, namely a very low vapour pressure, low flammability, high thermal stability, wide potential window and high ionic conductivity. In this work, Nyquist plot and impedance spectroscopy at room temperature is proposed as an alternative method to obtain the ionic conductivity for ionic liquids by using a RLC precision meter Agilent HP 4284A. For this propose, the IL 1-butyl-3-methylimidazolium tetrafluoroborate (C4C1Im BF4) was selected and results were compared with the previously obtained from the conductimeter CRISON GLP31.

Temperature-dependent anomalous viscosity of aqueous solutions of imidazolium-based ionic liquids

“…For an electrolyte solution, in general, the ionic conductivity increases with the increase in temperature because of enhanced mobility of the available free ions due to their higher thermal energy. 89 However, in the present case, the conductivity initially decreases and then increases with the temperature. This is an opposite trend from the behaviour of viscosity.…”