In this manuscript are reported the synthesis and physicochemical characterization of low viscosity pyrrolidinium dicyanamide (DCA(-)) ionic liquids (ILs). Due to their high ionic conductivity, these fluorine-free, molecular solvent-free ILs are excellent candidates to be employed as electrolytes in electrochemical double layer capacitors (EDLCs). Tests of lab-scale prototypes reported herein show that DCA(-)-based EDLCs display high power at room temperature as well as high cycling stability. (C) 2015 Elsevier B.V. All rights reserved.