Abstract
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 by electrochemical impedance spectroscopy and were found ranging from 0.71 to 9.07 mS·cm−1 at 27.0 °C. In all cases, the conductivity of a given ionic liquid increased with a higher proportion of acid (1:2 ratio) which is explained mainly a smaller viscosity obtained in these conditions. Indeed, in most PILs, the dynamic viscosity (10.3−484 cp at 27.0 °C) is decreased by a higher acid proportion. Both parameters were used to construct a Walden plot in order to evaluate the quality of these protic ionic liquids (PILs) and compare them with common room temperature (RT) molten salts. The physicochemical properties of the PILs were then compared with the specific capacitance values obtained with a thermally prepared RuO2 electrode in these ionic liquid electrolytes. This work brings evidence ...
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