Influence of the Conductivity and Viscosity of Protic Ionic Liquids Electrolytes on the Pseudocapacitance of RuO2 Electrodes

• DOI: 10.1021/jp8084149
• Publication Date: 2009-02-03T19:36:59Z
• Authors: Laurence Mayrand-...; Dominic Rochefort
• Keywords: Pseudocapacitance; Trifluoroacetic acid

Several new protic ionic liquids (PILs) were prepared by mixing trifluoroacetic acid (TFA) with various heterocyclic amines using different base:acid ratios (1:1 and 1:2). Their specific conductivities have been measured electrochemical impedance spectroscopy found ranging from 0.71 to 9.07 mS·cm−1 at 27.0 °C. In all cases, the conductivity of a given liquid increased higher proportion (1:2 ratio) which is explained mainly smaller viscosity obtained in these conditions. Indeed, most PILs, dynamic (10.3−484 cp °C) decreased proportion. Both parameters used construct Walden plot order evaluate quality compare them common room temperature (RT) molten salts. The physicochemical properties PILs then compared capacitance values thermally RuO2 electrode electrolytes. This work brings evidence that pseudocapacitance involved energy storage mechanism studied here shows could eventually be as electrolytes metal oxide-based supercapacitors.