“…Moreover, the constitutive equation of fractional capacitor may also involve fractional differentiation orders higher than one, as in [20]. The experimental work includes testing of supercapacitors at various frequencies and comparison of obtained results with the theoretical models, see [1,22], or even manufacturing electric elements of fractional order, see [21,24,28], as well as their realizations by the use of constant phase element, as demonstrated in [5,6]. The modeling of electrochemical double-layer capacitors also includes the fractional calculus, that is investigated in [19] through the frequency characteristics, in [26,35] through the time domain analysis, and in [27] by the analysis of capacitor's quality properties.…”