Electrical conductivity and Nyquist plot of C₄C₁Im BF₄ at room temperature by impedance spectroscopy

Ionic liquids (ILs) represents, nowadays, a real alternative for electrochemical applications such as organic solvents, electrolytes, dye-sensitized solar cells, lubricants and sensors among others, due to their amazing 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, using a RLC precision meter Agilent HP 4284 A, to obtain the ionic conductivity for ionic liquids in the frame of dielectric constant in the frequency range of 1 Hz to 1 MHz, by determination of the conductive regime through frequency dependence. 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 at a constant frequency of 500 Hz.