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1
Content available Carbon nanotubes functionalized by salts containing stereogenic heteroatoms as electrodes in their battery cells
Zdanowska S., Pyzalska M., Drabowicz J., Kulawik D., Pavlyuk V., Girek T., Ciesielski W.
Polish Journal of Chemical Technology
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2016
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Vol. 18, nr 4
22--26
EN
This paper concentrates on electrochemical properties of groups of multi-walled carbon nanotubes (MWCNT) functionalized with substituents containing a stereogenic heteroatom bonded covalently to the surface of the carbon nanotube. This system was tested in Swagelok-type cells. The cells comprised a system (functionalized CNT with salts containing S and P atoms) with a working electrode, microfiber separators soaked with electrolyte solution, and a lithium foil counter/reference (commercial LiCoO2 ) electrode. The electrolyte solution was 1 M LiPF6  in propylene carbonate. Using standard techniques (cyclic voltammetry/chronopotentiometry), galvanostatic cycling was performed on the cells at room temperature with a CH Instruments Model 600E potentiostat/galvanostat electrochemical measurements. Methods of functionalization CNT were compared in terms of the electrochemical properties of the studied systems. In all systems, the process of charge/discharge was observed.
2
Content available Nowoczesne materiały do przechowywania wodoru jako paliwa przyszłości
Folentarska A., Kulawik D., Ciesielski W., Pavlyuk V.
Chemistry, Environment, Biotechnology
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2016
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Vol. 19
125--130
PL
W niniejszym artykule przedstawiono nowoczesne materiały mogące posłużyć do magazynowania paliwa przyszłości, jakim jest wodór. Omówiono wodór jako alternatywne źródło energii mogące perspektywicznie zastąpić wyczerpujące się zasoby ropy czy gazu ziemnego. Opisano systemy magazynujące wodór, tj. zbiorniki ciśnieniowe wodoru gazowego , zbiorniki ciekłego wodoru w postaci wodorków metali, wodorków chemicznych oraz w materiałach węglowych.
EN
This article presents modern materials that can be used for storing fuel of the future, which is hydrogen. Hydrogen as an alternative energy source that could prospectively replace that are running out reserves of oil or natural gas was discussed. Systems for storing hydrogen, such as hydrogen gas pressure vessels, tanks of liquid hydrogen in the form o f metal hydrides, chemical hydrides, and carbon materials were described.
3
Content available remote Właściwości fizykochemiczne bromowanych wielościennych nanorurek węglowych funkcjonalizowanych tiofosforanem 0-metylo-0-2-naftylo-L-N-metyloefedryniowym
Pyzalska M., Zdanowska S., Kulawik D., Pavlyuk V., Drabowicz J., Ciesielski W.
Przemysł Chemiczny
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2015
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T. 94, nr 12
2189-2194
PL
Przedstawiono wyniki badania syntezy wielościennych nanorurek węglowych funkcjonalizowanych podstawnikami zawierającymi siarkę i fosfor. Omówiono również wykonane badania elektrochemiczne oraz analizę strukturalną izolowanych produktów przy wykorzystaniu spektroskopii Ramana i dyfrakcji promieniowania rentgenowskiego (XRD). Przedstawiono wyniki badań toksyczności ogniw przygotowanych na bazie otrzymanego produktu na rośliny jednoliścienne (jęczmień jary) oraz rośliny dwuliścienne (rzodkiewka zwyczajna). Uzyskane wyniki wskazują, że otrzymane funkcjonalizowane nanorurki mogą być wykorzystane jako ogniwa w nowej generacji baterii przyjaznych dla środowiska naturalnego.
EN
Brominated carbon nanotubes were modified by the treatment with L-N-methylephedrinium O-methyl-O-2-naphtylphosphonothioate and studied for electrochem. properties and toxicity against barley and radish. The modified nanotubes used in cell electrodes showed good ability for energy storage and low toxicity against the plants up to concn. 1000 mg/kg in soil.
4
Content available Crystal and electronic structures of TbCo0.29Li0.05Sn2 and TbCu0.25Li0.09Sn2
Stetskiv A., Pavlyuk V.
Chemistry, Environment, Biotechnology
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2014
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Vol. 17
7--15
EN
The new quaternary stannides, TbCo0.29Li0.05Sn2 and TbCu0.25Li0.09Sn2 crystallizes in the orthorhombic CeNiSi2 structure type with space group Cmcm. The four independent 4c atom positions (m2m site symmetry), three are fully occupied by individual atoms (two by Sn and one by Tb atoms) and the fourth is occupied by Li and transition metals Co or Cu atoms with a statistical distribution. The Tb coordination polyhedron is a 21-vertex pseudo-Frank–Kasper polyhedron. One Sn atom is enclosed in a tricapped trigonal prism, the second Sn atom is in a cuboctahedron and the statistically distributed (Li,Co or Cu) site is in a tetragonal antiprism with one added atom. Electronic structure calculations were used for the elucidation of reasons for and the ability of mutual substitution of lithium and transition metals. Positive charge density was observed around the rare earth atom and the Li and transition metal atoms, the negative charge density in the proximity of the Sn atoms.
5
Content available Structure data at 150 K for diammonium oxalate monohydrate, [NH4]2[C2O4][H2O]
Mielniczek-Brzóska E., Dmytriv G., Pavlyuk V., Griffin A.
Chemistry, Environment, Biotechnology
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2013
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Vol. 16
73--78
EN
The single crystals of perfectly quality of the diammonium oxalate monohydrate, [NH4]2[C2O4][H2O], were obtained by the improved methods of crystal growth from solution. The crystal structure of title compound was studied at 150 K using modern X-ray equipment. At this temperature, as well as at room temperature, this compound crystallizes in the orthorhombic symmetry wiith P21212 space group. The unit cell of the title compound is formed by four amonium cations, two oxalate anions and water molecules, with a 2:1:1 cation-anion-water ratio. At 150 K oxalate ion is twisted by 26.9 (1)°. The similar twist angle (26.6 (4)° was observed at the room temperature. Central carbon-carbon bond in oxalate ion is insignificantly longer (1.568 Å) in comparing with this bond at room temperature (1.559 Å).
6
Content available Crystal structures of ErGe2 and TmGe2 compounds
Matvijishyn R., Pavlyuk V., Shpyrka Z., Serkiz R.
Chemistry, Environment, Biotechnology
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2010
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Vol. 14
35-40
EN
Crystal structures of ErGe2 and TmGe2 compounds were determined by X-ray single crystal diffraction. Both TmGe2 and ErGe2 crystallized with the ZrSi2 structure type (space group Cmcm).
7
Content available remote Elektrochemiczna charakterystyka eutektycznego stopu La3Ni w środowisku 0,1M KOH
Kukuła I., Bala H., Marciniak B., Pavlyuk V.
Ochrona przed Korozją
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2009
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nr 4-5
202-204
PL
Dokonano charakterystyki elektrochemicznej eutektycznego stopu La3Ni w odpowietrzonym, silnie alkalicznym roztworze wodnym (pH = 13). Wykonano potencjokinetyczne krzywe polaryzacji w szerokim zakresie potencjałów (-2,0 do +2,0 V wzgl. NEK), stosując jego skaning w kierunku anodowym i katodowym. W oparciu o dane termodynamiczne dokonano interpretacji krzywych polaryzacji pod kątem prawdopodobnych produktów cząstkowych procesów elektrodowych. Zwrócono uwagę na powstawanie warstw powierzchniowych (wodorkowych i tlenkowych) na powierzchni stopu w procesie polaryzacji i zaproponowano interpretację krzywych z uwzględnieniem zależnych od potencjału przemian fazowych w obrębie warstw powierzchniowych.
EN
Electrochemical characterization of eutectic La3Ni alloy in deaerated, strong alkaline (pH = 13) aqueous solution has been made. Potentiokinetic polarization curves in wide potential range (-2.0 to +2.0 V vs SCE) have been measured. Electrode potential has been scanned both in anodic- and in cathodic direction. The polarization curves have been interpreted on the basis of thermodynamic data in order to determine the feasible products of partial electrode processes. Attention has been paid to the formation of superfi cial hydride- and oxide layers in the process of alloy polarization. Phase transformations within the superfi cial layers dependent on the potential have been proposed.
8
Single Crystal Investigation of Tb3Cu4Sn4 and Dy3Cu4Sn4 Stannides with Gd3Cu4Ge4-type Structure
Romaka V., Pavlyuk V., Marciniak B., Tkachuk A.
Polish Journal of Chemistry
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2008
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Vol. 82, nr 11
2049-2055
EN
The crystal structure of the R3Cu4Sn4 ternary stannides (R = Tb and Dy) was determined by single crystal X-ray diffraction method. Both investigated compounds crystallize in the Gd3Cu4Ge4 structure type (space group Immm). The detailed structure analysis defined the "tolerance" ranges of the atomic radii for the rare-earth element in all R3Cu4Sn4 compounds and predicted the possibility of existence of the Lu3Cu4Sn4 stannide.
9
New R3T1-xZnx compounds with AuCu3 structure type
Zelinska O., Solokha P., Pavlyuk V., Zelinskiy A.
Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie
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2003
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Vol. 8
89--91
10
Interaction of the components in the Ni-Zn-Bi ternary system at 570 K
Chumak L., Pavlyuk V.
Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie
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2003
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Vol. 8
83--87
11
Interaction of the Components in Li-V-Sn System at 470 K
Azarska O., Pavlyuk V.
Polish Journal of Chemistry
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2003
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Vol. 77 / nr 8
1027-1031
EN
The isothermal section of the Li-V-Sn system at 470 K has been investigated by X-ray phase analysis. There is an unmixing region, which extends at ternary system to about 12 at. % of Sn. Two ternary phases Li11V3Sn4 and ~LiV2Sn and solid solutions based on the binary compounds were obtained. Crystal structures were determined for both ternary phases: Li11V3Sn4 is a superstructure to Li13Sn5 binary compound, and LiV2Sn crystallizes in a BiF3 structure type. The solubility of the third component in the binary compounds is less than 10 at. %.
12
X-Ray Investigation of the Ce-Cu-Cd System at 570 K
Horechyy A., Pavlyuk V., Bodak O.
Polish Journal of Chemistry
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1999
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Vol. 73, nr 10
1681-1685
EN
An isothermal section of the phase diagram of Ce-Cu-Cd system at 570 K was investigated by X-ray method. Six ternary compounds were found. The structure of CeCuCd compound is a derivate from a CeCd structure type.
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