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Content available remote Fe2+- and Er2+-intercalative modification of porous and electron structure of activated carbon and its influence on supercapacitor parameters
Venhryn B.Ya., Grygorchak I.I., Kulyk Yu.O., Mudry S.I., Strelchuk V V, Budzulyak S I, Dovbeshko G I, Fesenko O M
Materials Science Poland
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2014
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Vol. 32, No. 2
272--280
EN
An influence of both porous and electron structure on the processes in an electric double layer (EDL) determining the main working parameters of carbon-based supercapacitors has been studied in order to improve them. The investigations involved impedance spectroscopy, X-ray small angle scattering, confocal micro-Raman spectroscopy, infra-red and M¨ossbauer spectroscopy. Fe2+- and Er2+-intercallative modifications of nanoporous carbon were performed. It was found that the modification process characteristics correlated with the structure parameters of the EDL.
2
Content available remote New trends in nanoscale compounds for energy storage
Stotsko Z. A., Venhryn B.Ya.
Journal of Achievements in Materials and Manufacturing Engineering
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2012
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Vol. 54, nr 2
227--232
EN
Purpose: Mechanism of supramolecular complexes C formation and investigation of their electrochemical characteristics were the aim of this paper. Supramolecular complexes were created by inserting an organic receptor into nano/mesopores of activated carbon. Design/methodology/approach: Electrochemical studies of supramolecular complexes C were carried out by means of impedance spectroscopy, cyclic voltammetry and galvanostatic cycling. Findings: The possibility to combine the capacitive storage with faradaic energy generation in one unit is proved. It can be reached by means of active electrode formation as a supramolecular complex C. It is shown that faradaic generation of energy occurs at low positive potentials, whereas the capacitive one at higher potentials. Method of synthesis of blue graphite is developed. Research limitations/implications: This research is a complete and accomplished work. Practical implications: Supramolecular complexes, obtained in this work, could be regarded as promising electrode materials in devices of energy generation, storage and transformation. Originality/value: This work is of urgent importance for physics and chemistry of energy generation, storage and transformation, because it opens new possibilities to new highly effective electrode materials search and enables to reach a high values of functional characteristics.
3
Content available remote Porous structure of carbon-based materials studied by means of X-ray small angle scattering method
Venhryn B.Ya., Grygorchak I.I., Kulyk Yu.O., Mudry S.I., Shvets R.Ya.
Optica Applicata
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2008
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Vol. 38, nr 1
119-125
EN
The porous structure of carbon-graphite materials: styrene-divinylbenzene copolymer (SBC) and fruit stones (FS) has been studied by means of X-ray small angle scattering method. The angular dependences of scattered intensities have been obtained and analyzed by means of the Guinier method. The main parameters of porous structure have been determined (inertia radius, pore size distribution functions, specific surface areas).
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