Density, dynamic viscosity, electrical conductivity, electrochemical potential window, and excess properties of ionic liquid N-butyl-pyridinium dicyanamide and binary system with propylene carbonate

The densities, dynamic viscosities, and electrical conductivities of the ionic liquid (IL) N-butyl-pyridinium dicyanamide ([C(4)py][DCA]) and its binary system with propylene carbonate (PC) were measured at the temperature range from 288.15 to 353.15 K over the whole composition range at atmospheric pressure. In addition, some significant thermodynamic parameters were also estimated. The excess molar volumes (V-E) and dynamic viscosity deviations (Delta eta) of the mixtures were calculated, and the change of V-E and Delta eta were fitted by the Redlich Mister (R-K) polynomial equation. The temperature dependences of dynamic viscosities and electrical conductivides of the binary system under the whole concentration range (molar ratio of IL from 1 to 0) were graphically described by the Vogel-Fulcher-Tamman (VFT) equation and Arrhenius equation. Through the Walden rule, the ionicity of binary system at each concentration was evaluated as a function of the temperature from 288.15 to 353.15 K. Further, according to three-electrode method, the electrochemical potential windows (EPWs) of binary system (x(IL) = 1.0000, 0.7885, 0.4997, 0.1003) were measured to investigate the electrochemistry stability. In a supercapacitor, the IL mixtures of two molar ratios (x(IL) = 1.0000, 0.7885) were applied as electrolytes, and the performance of the supercapacitors were determined by cyclic voltammetry (CV) method. (C) 2017 Elsevier B.V. All rights reserved.