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B. Ya. Venhryn, I. I. Grygorchak, B. P. Bakhmatyuk, Yu. O. Kulyk, and S. I. Mudry
«Influence of Ultrasonic Treatment of Activated Carbon in Cavitation and Precavitation Regimes on Capacitive and Pseudocapacitive Energy Storage in Electrochemical Supercapacitors »
605–617 (2013)

PACS numbers: 62.80.+f, 81.05.Rm, 81.05.U-, 81.70.Cv, 82.45.Yz, 82.47.Uv, 84.60.Ve

Influence of ultrasonic treatment of activated carbon on the electric double layer in interface between the carbon and the 7.6 m KOН, 4 m KI, and 2 m ZnI2 aqueous electrolyte solutions as well as on the working parameters of supercapacitors on their base is studied by means of precision porometry, small angle X-ray scattering, cyclic voltamperometry, electrochemical impedance spectroscopy, and computer simulation methods. As shown, the ultrasonic treatment at precavitation regimes causes the significant (more than by 200 times) increase of density of states at the Fermi level that is the reason not only quantitative but also qualitative changes in farad–volt dependences. At the same time, an acoustic cavitation field unblocks the Helmholtz capacitance due to large decrease of volume-charge-region resistance. Using these data, we propose the new electrochemical system of functional-hybrid supercapacitor with specific capacitance 1100 F/g and specific energy 49 W•h/kg.