efanyk Ciscarpathian National University

Ivano-Frankivs’k, Ukraine

efanyk Ciscarpathian National University

Ivano-Frankivs’k, Ukraine
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Rachiy B.I.,efanyk Ciscarpathian National University | Budzulyak I.M.,efanyk Ciscarpathian National University | Ivanenko E.A.,Taras Shevchenko National University | Revo S.L.,Taras Shevchenko National University
Surface Engineering and Applied Electrochemistry | Year: 2015

Results are presented of studies on the structure and properties of nanocomposite materials (NCM) based on nanoporous carbon (NPC) and thermally exfoliated graphite (TEG). NCM is promising as electrode material for supercapacitors (SC) with a double electric layer. NPC was obtained from a phytogenic raw material using hydrothermal carbonization. TEG was produced from oxidized natural graphite by thermal exfoliation. A JSM-6490LV (JEOL Ltd., Japan) electron microscope was used to study the samples’ microstructure. A Quantachrome Autosorb instrument was used to study nitrogen adsorption/desorption isotherms and analyse porous structure. The multipoint Brunauer–Emmett–Teller (BET) method was used to determine the specific surface area of electrodes. The electrochemical properties of the samples were analyzed using the methods of galvanostatic cycling and electrochemical impedance spectroscopy employing an AUTOLAB PGSTAT12 (ECO CHEMIE, the Netherlands) measuring instrument. Our study shows that the employment of TEG in this NCM reduces the internal resistance of supercapacitors (SC), and this increases their specific capacitance. The results of electrochemical studies show that the capacitance of SCs based on the noted NCMs amounts to 155–160 F/g. An equivalent circuit is proposed, allowing the simulation of impedance spectra in the frequency range of 10−3–105 Hz. A physical interpretation of each element of the electric circuit is presented. © 2015, Allerton Press, Inc.


Revo S.L.,Taras Shevchenko National University | Budzulyak I.M.,efanyk Ciscarpathian National University | Rachiy B.I.,efanyk Ciscarpathian National University | Kuzishin M.M.,efanyk Ciscarpathian National University
Surface Engineering and Applied Electrochemistry | Year: 2013

Results are presented of studies of composite materials based on nanoporous carbon for application as an electrode material for supercapacitors with an aqueous KOH electrolyte solution. The optimum concentration ratio of the formula components for the electrode material is found on the basis of the studies of the power-capacitance characteristics of the studied samples of such capacitors. © 2013 Allerton Press, Inc.

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