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1
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 Improvement of supercapacitor parameters by nickel ion intercalation into activated carbon
Venhryn B. Y., Grygorchak I. I., Kulyk Y. O., Mudry S. I.
Materials Science Poland
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2013
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Vol. 31, No. 1
126-132
EN
The relation between the porous structure and the electron structure in carbon materials was investigated in order to optimize the effiency of the physical-chemical processes in an electric double layer (EDL) formed at the boundary between the carbon material and the electrolyte (KOH 30 % aqueous solution). In particular, an Ni2+ intercalative modification of nanoporous carbon resulted in more than a triple increase in the specific capacitance and a significant improvement of the charge-discharge kinetics in the EDL.
3
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.
4
Content available remote Changes in the fractal and electronic structures of activated carbons produced by ultrasonic radiation and the effect on their performance in supercapacitors
Venhryn B., Grygorchak I., Stotsko Z., Kulyk Y., Mudry S., Strelchuk V., Budzulyak S., Dovbeshko G., Fesenko O.
Archives of Materials Science and Engineering
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2012
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Vol. 57, nr 1
28-37
EN
Purpose: Effect of ultrasonic irradiation on change of electron structure as well as fractal one of activated carbons and motivation that these changes are most responsible for the improvement of functional parameters in supercapacitors, were the aim of this paper. Design/methodology/approach: Experimental studies were carried out by means of impedance spectroscopy, cyclic voltammetry, X-Ray diffraction, small angle X-Ray diffraction, X-Ray photoelectron spectroscopy, IR-spectroscopy, Micro-Raman spectroscopy and galvanostatic cycling methods. Findings: Ultrasonic modification of carbon is effective method to increase the specific capacitance as well as power of carbon-based supercapacitors. Changes of parameters of double electric layer are tightly related with change of fractal dimension and allow increasing the percolate mobility of charge carries. Research limitations/implications: This research is a complete and accomplished work. Practical implications: Carbon materials, modified by ultrasonic irradiation, can be used as promising electrode materials in energy storage devices of new generation. Originality/value: This work is of urgent importance for studying of physical and chemical processes in energy storage systems. It is shown that method of ultrasonic irradiation is highly effective for modification of carbon-based materials as electrodes in supercapacitors.
5
Content available remote Supramolecular complexes C<18-crown-ether-6> and their application in devices for energy generation, storage and transformation
Venhryn B., Stotsko Z., Grygorchak I., Mudry S., Balaban O.
Archives of Materials Science and Engineering
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2011
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Vol. 52, nr 1
18-22
EN
Purpose: Formation of supramolecular complexes C<18-crown-ether-6> and investigation of their electrochemical characteristics was the aim of this paper. An organic receptor is inserted in nano/mesopores of activated carbon of these supramolecular complexes. Design/methodology/approach: Electrochemical studies of supramolecular complexes C<18-crown-ether-6> were carried out by means of impedance spectroscopy, cyclic voltammetry and galvanostatic cycling. Findings: It is shown that Faraday generation of energy occurs at low positive potentials whereas the capacitive storage - at higher potentials. As result the value of specific capacitance for AC of faradaic process 10000 F/g was reached as well as 154 F/g of non-faradaic process, whereas the same parameters for BAC equal 13350 F/g and 80 F/g, respectively. 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.
6
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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