Publications on the project |
048 Тhe formation of nanodimensional conducting channels in inorganic composite membranes |
Authors: | Dzyazko Yu.S., Vasilyuk S.V., Stefanyak N.V. | |
Summary: | By the use of the potentiometric method we determined the dimensions of conducting channels in inorganic membranes modified by nanolayers of the ion-exchange component-hydrated zirconium dioxide (HZD). The dimensions of the channels are within the interval 26-50 nm depending on the degree of filling the pores with the ion-exchanger. Effectively complete absence of the diffusion double electric layer in the pores is shown, therefore composite membranes should be considered as analogues of polymer ion-exchange membranes. | |
Keywords: | electrodialysis, membrane, membrane electrolysis, nanodimensional pores | |
Edition: | Journal of Water Chemistry and Technology | | | 2010,
274 – 288,Russian |
048 Tunable optical and nonlinear optical response of smectic glasses based on cobalt alkanoates |
Authors: | Yu.A. Garbovskiy, A.V. Gridyakina, G.V. Klimusheva, A.S. Tolochko, I.I. Tokmenko, T.A. Mirnaya | |
Summary: | The nonlinear optical response of anisotropic smectic glasses
based on cobalt alkanoates has been studied using dynamic holography. Laser-dynamic gratings induced by the action of nanosecond laser pulses were observed and analysed for such materials. It was found that the cubic optical nonlinearity of all the anisotropic glasses studied had an electronic origin in the nanosecond range, caused by nonlinear polarisation
of the cobalt alkanoate complexes. Fundamental optical (refractive index and absorption coefficient) and nonlinear optical (nonlinear susceptibility and polarisability) parameters of mesomorphic glasses based on cobalt alkanoates could be tuned by varying the length of the alkanoate anion chain, thereby determining the
interlayer smectic distance.
| |
Keywords: | metal alkanoates, smectic glasses, third-order nonlinear optical response | |
Edition: | Liquid Crystals | | | 2010,
1411-1418,English |
048 Phase Diagrams of Mesogenic Binary Systems of Cobalt (II) and Univalent Metal Caprylates |
Authors: | Tokmenko I.I., Mirnaya T.A., Yaremchuk G.G. | |
Summary: | The phase diagrams of binary systems of cobalt(II) octanoate and lithium, sodium, potassium, and thallium(I) octanoates have been studied by differential thermal analysis and polythermal polarization microscopy. In all systems, continuous or limited liquid crystalline solutions of smectic modification are formed. The temperature and composition ranges of the formation of liquid crystals and glasses have been determined. | |
Keywords: | liquid crystal, glass, metal alkanoate, phase diagram | |
Edition: | Zeitschrift für Naturforschung A. | | | 2011,
661-667,English |
048 Peculiarities of CdS nanoparticles synthesis in ionic liquid crystalline melts based on cadmium alkanoates. |
Authors: | V.M.Asaula, T.A. Mirnaya, G.G. Yaremchuk | |
Summary: | Соnditions of synthesis of the CdS semiconductor
nanoparticles in matrix of ionic liquid crystal
depending on length of alkanoate-anion chain,
kind of injection S2-(tiourea) into nanoreactor,
reaction time and medium have been improved.
Size of CdS nanoparticles have been estimated by electron spectroscopy. | |
Keywords: | CdS nanoparticles, Quantum dots, Liquid crystals; Chemical template synthesis; Optical properties | |
Edition: | Ukrainian Chemistry Journal | | | 2010,
27-29,Ukrainian |
048 Preparation CdSe nanoparticles by electrosynthesis |
Authors: | S.S. Fomanyuk, Yu.S. Krasnov, G.Ya. Kolbasov, T.A. Mirnaya, V.N. Asaula, G.G. Yaremchuk | |
Summary: | Colloidal solutions and powders of CdSe nanoparticles with size from 1 to 5 nm were obtained by the electro synthesis. It has been shown that regime of the electrolysis and the concentration ratio of Cd 2+ and Se032- in the initial electrolyte affect on the structure and size of CdSe nanocrystals. | |
Keywords: | CdSe nanoparticles, quantum dots, ; optical properties, electrosynthesis, fluorescence | |
Edition: | Ukrainian Chemistry Journal | | | 2011,
35-38,Russian |
048 Phase diagrams and optical properties of binary liquid crystalline systems of cobalt (II) caprylate with lithium and lead caprylates |
Authors: | Mirnaya T. A., Tokmenko I. I., Yaremchuk G. G., Corkery R. W | |
Summary: | The concentration and temperature ranges of liquid crystal and glass formation in binary systems of cobalt (II) caprylate with either lithium or lead caplylates have been studied by differential thermal analysis and optical polarization microscopy. Absorption spectra of Co(II) cations in mesophases and glasses of these binary caprylate systems have been analyzed as a function of temperature and composition to get information on the coordination of Co(II) ions.For the binary system of lead–cobalt caprylate, we found that the Co(II) ions are octahedrally coordinated over the range of temperatures and compositions studied, whereas in the binary lithium–lead caprylate system, the Co(II) ions can exist in both octahedral and tetrahedral coordination depending on composition and temperature. Thermochromic behavior was observed for all compositions studied here, from blue to violet and pink, depending on the composition and temperature of the system studied. An unusual increase of optical density with decreased Co(II) ion concentration has been observed for the Co–Li caprylate binary system up to 50 mol%. An increasingly ionic Co(II) coordination environment as Li ion concentration increases facilitates a concomitant increase in the proportion of more optically dense tetrahedrally coordinated Co(II) ions. | |
Keywords: | phase diagram, optical properties, binary liquid crystal, cobalt caprilate | |
Edition: | Journal of Non-Crystalline. Solids | | | 2011,
3053-3057,English |
048 Nonlinear optics of electrochromic and photosensitive cells of ionic liquid crystals and mesomorphic glasses |
Authors: | Klimusheva G., Garbovskiy Yu., Вugaychuk S., Tolochko A., Melnik D., Tokmenko I., Mirnaya T. | |
Summary: | We study structural and nonlinear optical properties of lyotropic ionic liquid crystals with electrochromic impurities and mesomorphic glasses of the homological series of Co alkanoates. Nontraditional nonlinear optical mechanisms of these materials are proposed. The investigated cells are characterized by high value of optical nonlinearity (χ(3) ∼ 10−7–10−8 esu), fast recording and relaxation of dynamical holographic gratings. They are perspective to applying in high-speed telecommunication systems. | |
Keywords: | mesomorphic glasses, nonlinear optics, photosensitive cells | |
Edition: | Molecular Crystals and Liquid Crystals | | | 2011,
142/[380]-151/[389],English |
048 Synthesis and optical properties of liquid crystalline nanocomposites of cadmium octanoate with CdS quantum dots |
Authors: | T.A. Mirnaya, V.N. Asaula, S.V. Volkov, A.S. Tolochko, D.A. Melnik, G.V. Klimusheva | |
Summary: | Nanosized CdS semiconductor crystals have been synthesized in liquid crystalline and isotropic melts based on cadmium octanoate. Glassy mesomorphic nanocomposites have been obtained by cooling melts. It has been shown that CdS nanocrystals in vitrified matrices are quantum dots (QDs) which are characterized by a high degree of monodispersity and have a size of 2-4 nm depending on synthesis conditions. The fluorescence properties of CdS QDs in two-dimensionally ordered cadmium octanoate glass have been investigated for the first time and can serve as a model for studying radiative processes in such new matrices. | |
Keywords: | CdS nanoparticles, Quantum dots, Liquid crystals; Chemical template synthesis; Optical properties | |
Edition: | Physics and Chemistry of Solid State | | | 2012,
131-135,English |
048 Synthesis of nanokompozitiv of palladium and platinum on metallic and oxide surfaces from acetamid-khloridnikh of fusions and organic solvents |
Authors: | N.I. Buryak, S.A. Kochetova, S.V. Volkov | |
Summary: | The state and behavior of complex Pd and Pt ions in organic solvents (ethanol, ethylene glycol, glycerol) and in the anodic dissolution of these metals in the CH3CONH2-NH4Cl melt have been studied by spectroscopic methods. It has been shown that Pd and Pt nanocomposites can be obtained from acetamide-chloride melts on the metals Fe, Cu, Mo, W and from organic solvents on fine-grained SiO2 and ZrO2 oxides. | |
Keywords: | Palladium, platinum, synthesis, organic solvents, nanokompoziti, spectroscopy | |
Edition: | Ukrainian chemical journal | | | 2010,
67–71,Ukrainian |
048 Low-temperature synthesis of platinum nanoheterostructures on silicen and zirconium oxides in organic solvents |
Authors: | N.I. Buryak, S.V. Volkov | |
Summary: | The state and behavior of Pt(II) solvato complexes in ethanol, ethylene glycol, glycerol at 200 C have been studied by spectroscopic methods. It has been shown that platinum nanoheterostructures can be obtained with fine SiO2 and ZrO2 oxides in alcohols a reductant. | |
Keywords: | Platinum solvatocomplex, synthesis, organic solvents, nanoheterostructures | |
Edition: | Ukrainian chemical journal | | | 2011,
17–20,Ukrainian |
048 Low-temperature synthesis of metal nanoparticles and rhodium nanoheterostructures from complexes in organic solvents |
Authors: | N.I. Buryak, S.V. Volkov | |
Summary: | It has been found by spectroscopic methods of investigation that solvatocomplexes Rh(ІІI) - [Rh(C2H6O)6]3+ and [Rh(C2H6O2)6]3+ of octahedral symmetry Oh.are formed in ethanol and ethylene glycol. Using a reductant, destruction of Rh(ІІI) solvatocomplexes has been carried out at 200C to obtain Rh metal nanoparticles (10-30 nm) and Rh nanoheterostructures with finely divided SiO2 and ZrO2 oxides of 20-40 nm size. | |
Keywords: | rhodium solvatoсomplex, synthesis, organic solvents, metal nanoparticles | |
Edition: | Ukrainian chemical journal | | | 2012,
32-35,Ukrainian |
048 Transformation of Re(ІІІ) complex compounds into metal nanoparticles in aqueous and alcoholic media |
Authors: | M.I. Buryak, O.G. Yanko, S.V. Volkov | |
Summary: | The state and structure of Re(ІІІ) complex compounds in an aqueous and a hydrochloric acid medium, ethyl alcohol and ethylene glycol at 20-150оС have been determined on the basis of spectroscopic studies. Methods for synthesis of rhenium nanoparticles by the reductive destruction of Re(ІІІ) complex compounds in liquid media have been developed and characterized. | |
Keywords: | Re (III) complexes, synthesis of nanoparticles, water and alcohol solvents, spectroscopy | |
Edition: | Ukrainian chemical journal. | | | 2013,
79-82,Ukrainian |
048 Polymer Ion-Exchangers Modified with Zirconium Hydrophosphate for Removal of Cd2+ Ions from Diluted Solutions |
Authors: | Dzyazko Yu.S., Ponomaryova L.N., Volfkovich Yu.M., Sosenkin V.E., Belyakov V.N. | |
Summary: | Hybrid ion-exchangers have been synthesized by modification of strongly acidic cation-exchange resin with zirconium hydrophosphate. The samples were investigated with scanning and transmission electron microscopy and standard contact porosimetry. Single nanoparticles and their aggregates have been found in the polymer. The nanoparticles in transport pores increase the electrical conductivity of ion-exchanger from 0.21 to 0.65 Ohm-1m-1. The diffusion coefficient of Cd2+ ions reaches 2.4310-11 m2 s-1 for initial resin and (2.50–4.34) 10-11 m2s-1 for nanocomposites. The inorganic constituent improves Cd2+ recovery from a solution, which contains also Ca2+ and Mg2+. The degree of Cd2+ removal is 18% for non-modified resin and 99% for the sample containing 38 mass% zirconium phosphate. | |
Keywords: | cation-exchange resin and membrane, nanocomposite, organic-inorganic ion-exchanger, standard contact porosimetry, zirconium phosphate. | |
Edition: | Separation Science and Technologies | | | 2012,
2140-2149,English |
048 Modification of ceramic membranes with inorganic sorbents. Application to electrodialytic recovery of Cr(VI) anions from multicomponent solution. |
Authors: | Dzyazko Yu.S., Rudenko A.S., Yukhin Yu.M., Palchik A.V., Belyakov V.N. | |
Summary: | Composite membranes have been obtained by insertion of two-component modifier (up to 2.7 mass %) into pores of ceramics. The modifier included amorphous hydrated zirconium dioxide as well as crystalline bismuth basic nitrate Bi6O5(OH)3(NO3)53H2O, which is characterized by high sorption ability towards Cr(VI) anions due to formation of additional Cr-containing phases. The membranes were investigated with TEM, SEM and nitrogen adsorption technique. The modifier was found to exist in a form of aggregated nanoparticles, which evidently block macropores of ceramics and form secondary porous structure. The pores, which are attributed to the modifier, as well as its high surface charge density, provide selectivity of the composites towards anions in acidic media. Modification caused a decrease of their resistivity coefficient in 2.5-3.5 times in a comparison with pristine membrane, the composite materials do not obey Archie’s law. The membranes were applied to electrodialytic recovery of Cr(VI) species from a highly concentrated solution, which contained also Cu(II), Ni(II) and Cr(III) cations. The most considerable current efficiency of Cr(VI) anions (46-92 %) and the highest removal degree of these species (98 %) were found for the composite material, which is characterized by the highest surface charge density (0.96 C m-2). | |
Keywords: | composite membranes, nanoparticles, electrodialysis, bismuth basic nitrate, hydrated zirconium dioxide, chromate. | |
Edition: | Desalination | | | 2014,
43-51,English |
048 Composite inorganic membranes containing nanoparticles of hydrated zirconium dioxide for electrodialytic separation. |
Authors: | Dzyazko Yu.S., Volfkovich Yu. M., Sosenkin V. E, Nikolskaya N.F., Gomza Yu.P. | |
Summary: | The aim of the work was to elucidate the nature of charge-selective properties of macroporous composite inorganic membranes modified with nanoparticles of hydrated zirconium dioxide. The membranes have been investigated using methods of standard contact porosimetry, potentiometry, electron microscopy and small-angle X-ray scattering. The ion exchanger has been found to deposit inside pores of ceramics. Differential curves of pore volume distribution have been resolved using Lorentz functions; each maximum has been related to structure elements of the matrix and ion exchanger by means of calculations according to homogeneous and heterogeneous geometrical models. It was found that the voids, the radius of which is 4 to 8 nm, are responsible for charge selectivity of the composite membranes. These pores are formed due to blocking of macropores of ceramics with aggregates of nanoparticles of the ion exchanger; the radius of these aggregates is 20 to 24 nm. The membranes were applied to desalination of the solution containing NaCl. The removal degree of the salt from the solution reached 95% and 9% for the composite and unmodified membranes, respectively. | |
Keywords: | Composite ion exchange membranes, hydrated zirconium dioxide, nanoparticles, standard contact porosimetry, electrodialysis. | |
Edition: | Nanoscale Research Letters | | | 2014,
271-282,English |
048 Electrochemical synthesis of composite materials based on the nanoscale powders of tungsten carbides in molten salts |
Authors: | I.A.Novoselova, E.P.Nakoneshna, N.A.Karpushin, V.N.Bykov, G.I.Dovbeshko, A.D. Rynder | |
Summary: | The peculiarities of the partial and joint electroreduction of tungsten and carbon are studied at Pt and glassy-carbon cathodes in the chloride-oxide melt NaCl-KCl-Na2WO4-NaPO3-CO2 by the method of cyclic voltammetry. The fields of potentials, current densities and correlation of bath components are determined for the high-temperature electrochemical synthesis (HTES) of composite powder mixtures on the basis of tungsten carbides (WC and W2C) with carbon nanomaterials (CNM), monophase powders of WC and W2C. Physical – chemical properties, structural and morphological features of carbide products are studied by the methods of chemical analysis, XRD, SEM, TEM, BET, Raman spectroscopy. Investigations have shown that it is possible to produce by the electrolytic method the composition mixtures of nanosized powders of tungsten carbides (WC and W2C) with CNM of different composition, nanofibers and nanorods of hexagonal α-WC (diameter 25-200 nm, length – about 10 µm) with the specific surface about 40 m2/g, which can be used as electrode material for the different tasks of electrocatalysis. | |
Keywords: | electrochemical synthesis, molten salts, nanoscale powders, tungsten carbide, carbon nanomaterials, characteristic | |
Edition: | Metallofizika i noveĭshie tekhnologii | | | 2014,
491-508,Russian |
048 Сation catalysis in high-temperature electrochemical synthesis of tungsten carbides in molten salts |
Authors: | S.Volkov, I. Novoselova, V. Solovyev, L. Chernenko | |
Summary: | The paper presents a quantum-chemical model and experimental confirmation of cation catalysis phenomenon by the influence of magnesium cation on tungstate anion electroreduction to metallic tungsten in a chloride melt. Ab-initio calculations of the parameters of the {Mgn2+[WO4]2-}(2n-2)+ type species have been performed. Within the framework of this approximation the compositions for the most stable species in molten salts were obtained. Energy, charge and geometrical parameters of the electronic structure of cationized tungstate anions were determined depending on the n values. The peculiarities of electroreduction of tungstate anion and carbon dioxide have been studied by the method of cyclic voltammetry in the binary NaCl-KCl melt (molar ratio 1:1) on platinum electrodes at 750 0C separately and jointly, in the presence and without magnesium chloride. It has been shown that addition of Mg2+ (cation with strongly polarizing effect) in the melt is a necessary condition for the electrodeposition of tungsten in the same potential range as carbon from carbon dioxide and for the subsequent synthesis of tungsten carbides. The electrochemical synthesis of tungsten carbides WC and W2C in the form of dispersed powder has been effected in the system NaCl-KCl-Na2WO4-MgCl2-CO2. The optimal electrolysis conditions (composition of electrolytic bath, CO2 gas pressure, current densities) have been determined for the synthesis of single-phase WC powder. | |
Keywords: | electrochemical synthesis; tungsten carbides; cation catalysis; outersphere cations; electron transfer | |
Edition: | Research-Reviews in Electrochemistry | | | 2012,
81 – 90,English |
048 Electrochemical synthesis of nanoscale powders of carbon-containing compounds (doped, undoped carbon tubes and fibers, tungsten carbides) in molten salts. |
Authors: | Novoselova I. , Volkov S. | |
Summary: | Electrochemical synthesis in molten salts has great opportunities for production various carbon containing compounds (doped, undoped carbon tubes and fibers, tungsten carbides) in one step in the view of films and ultra-depressive powders. The peculiarities of partial and joint electrochemical reduction of carbon in solid state from CO2 and CO32- anion and tungsten from different ionic forms were studied by cyclic voltammetry. The mechanisms of electrode processes were suggested. Conditions (composition of electrolytic bath, temperature, cathodic current density, bath potential) of electrochemical synthesis of nanosized carbon materials were determined. Properties of produced carbon-containing compounds were analyzed by XRD, SEM, TEM, Raman and ESR spectroscopy, BET. Correlation of product properties against synthesis conditions and parameters were interrelated. | |
Keywords: | electrochemical synthesis, molten salts, carbon tubes and fibers, tungsten carbide | |
Edition: | Proceedings of the 2014 Shechtman Int. Symp., Mexico, Cancun | | | 2014,
299-322,English |
048 Studies of anti-fibrillogenic activity of phthalocyanines of zirconium containing out-of-plane ligands |
Authors: | Kovalska V., Losytskyy M., Chernii V., Volkova K., Tretyakova I., Cherepanov V., Yarmoluk S., Volkov S. | |
Summary: | Series of phthalocyanines of zirconium containing lysine, citric, nonanoic acid residues and dibenzolylmethane groups as out-of-plane ligands are firstly studied as inhibitors of fibrillogenesis using cyanine-based fluorescent inhibitory assay. It was shown that studied phthalocyanines at concentration of 20 μM inhibited aggregation reaction on 38.5–57.6% and inhibitory activity of phthalocyanines depended on the chemical nature of out-of-plane ligand. For the most active compound PcZrLys2 (zirconium phthalocyanine containing lysine fragment) the efficient inhibitor concentration was estimated to be 37 μM. AFM studies have shown that in the presence of PcZrLys2 the inhibition of fibrils formation and formation of spherical oligomeric aggregates took place. Due to the ability of phthalocyanines to decrease efficiently protein aggregation into the amyloid fibrils, modification of phthalocyanine molecules via out-of-plane substitutions was proposed as approach for design of anti-fibrillogenic agents with required properties. | |
Keywords: | amyloid fibril, spherical oligomeric aggregates, zirconium phthalocyanine, inhibition of fibrillogenesis, fluorescent assay, cyanine dye, atomic force microscopy | |
Edition: | Bioorganic and Medicinal Chemistry. | | | 2012,
330-334,English |
048 Inorganic membranes modified with nanocomposite of hydrated zirconium dioxide and bismuth oxynitrate. |
Authors: | Dzyazko Yu.S., Rudenko O.S., Yukhin Yu.M., Tsyba N.N., Belyakov V.N. | |
Summary: | Inorganic membranes have been synthesized by modification of macroporous ceramic matrix with nanocomposite of hydrated zirconium dioxide and bismuth oxynitrate. The obtained membranes were investigated using scanning electron microscopy as well as porometric and potentiometric methods. It was found that the membranes demonstrate charge selectivity within the interval of HCl concentration of 10-100 mol m-3: potenttiometric transport numbers of Cl- counter-ions reach 0.97. Radius of the pores, which determines charge selectivity, has been estimated as 3-6 nm. | |
Keywords: | | |
Edition: | Ukrainian Chemistry Journal. | | | 2012,
67-72,Russian |
048 Some peculiarities of electrochemically formed carbon structures on the surface of metals |
Authors: | L.S. Lysyuk, V.M.Ogenko, S.V.Volkov | |
Summary: | The paper presents results of investigations of nanosized carbon structures, which have been obtained from organic aromatic compounds on/in the surface layer of anodically oxidized valve metals | |
Keywords: | electrochemical dehydrocyclization of aromatic hydrocarbons, carbon structures, oxidized metals | |
Edition: | Problems of Chemistry and Chemical Technology | | | 2011,
25-26,Ukrainian |
048 Synthesis of cobalt-containing composite oxygen reduction electrocatalysts based on hybrid silica-carbon nanostructures |
Authors: | Pirskyy Yu.К., Ogenko V.M., Sharanda L.F., Gaidin А.V., Volkov S.V. | |
Summary: | The possibility of production of hybrid cobalt-containing nanostructured catalysts based on carbon nanotubes and alkoxysilanes is shown for electrocatalysts for oxygen reduction in fuel cells as an example.
Hybrid silica-carbon nanocomposites were synthesized by the acid hydrolysis of tetraethoxysilane and metyltriethoxysilane in the presence of carbon nanotubes (CNT) and cetyltrimethylbromide as a supramolecular template with introduction of cobalt from water solution of its nitrate. The compositions obtained were heat-treated at 250°С in air or at 400 and 600°С in argon.
Electrocatalytic activity in the reaction of oxygen reduction was studied by means of a "floating" gas-diffusion electrode in a tree-electrode electrochemical cell in 1М KOH. The nature of catalysts was determined by the IR spectrometry, X-ray diffraction and transmission electron microscopy.
It has been found that addition of cobalt to the silica-carbon nanostructure increases greatly its catalytic activity. It has been shown that the formation of catalytically active composite layer from silica-carbon sol depends on heat treatment conditions and atmosphere. A mechanism of oxygen reduction on silica-containing nanocompositions is proposed, and it has been shown that oxygen reduction takes place on the active centers of cobalt.
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Keywords: | oxygen electroreduction, electrocatalysts, carbon nanotubes, sol-gel technology, nanostructure.
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Edition: | Nanostructured materials science | | | 2012,
47-57,Russian |
048 Nanocomposite cathode materials based on cobalt-silica hybrid carbon nanostructures |
Authors: | Pirskyy Yu.K., Gaydin A.V., Sharanda L.F, Lysyuk L.S., Ogenko V.M. | |
Summary: | In this article the possibility of production of hybrid cobalt-containing nanocomposite catalysts based on carbon nanotubes and alkoxysilanes is shown for electrocatalysts for oxygen reduction in fuel cells as an example. It has been found that addition of cobalt to the silica-carbon nanostructure increases greatly its catalytic activity. It has been shown that the formation of catalytically active composite layer from silica-carbon sol depends on heat treatment conditions and atmosphere.
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Keywords: | oxygen electroreduction, electrocatalysts, carbon nanotubes, sol-gel technology, nanostructure. | |
Edition: | Materials Sixth International Scientific Conference "Physical-chemical basis for the formation and modification of micro - and nanostructures" FMMN 2012 | | | 2012,
106-110,Russian |
048 Nanostructured catalysts for oxygen electroreduction based on bimetallic monoethanolamine complexes of Co(III) and Ni(II) |
Authors: | Yu. Pirskyy, N. Murafa, А. Korduban, J. Šubrt | |
Summary: | Oxygen reduction electrocatalysts based on the monoethanolmine complexes {[CoEtm]2(μ-Etm)4Ni(NO3)2} and {[CoEtm]2(μ-Etm)4Ni(NO3)2} + activated carbon AG-3 have been obtained by high-temperature synthesis. The nature of active centers on the synthesized electrocatalysts was described. Using potentiostatic and cyclic potentiodynamic voltammetry, the kinetic characteristics of catalysts in the oxygen electroreduction reaction were determined. Thermal decomposition of the thermally unstable complexes was described and character of the active centers formed was discussed. The optimal synthesis temperature of electrocatalysts is 600 °C in an inert atmosphere. The calculated exchange current densities for the oxygen electroreduction reaction at the catalysts in 1 M KOH at 20 °C was j 0 = 1.01 × 10−3 A g−1–3.3 × 10−3 A g−1. The Tafel slopes of stationary polarization curves are 0.054–0.063 V for b 1 and 0.106–0.125 V for b 2 . The prepared electrocatalysts can be recommended only for electrochemical systems with alkaline electrolyte. | |
Keywords: | electrochemistry, oxygen electroreduction, electrocatalysis, electrocatalysts, synthesis, monoethanolamine complexes, nanostructure. | |
Edition: | Journal of Applied Electrochemistry | | | 2014,
1193–1203,English |
The events in the framework of the project |
048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048 048
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048 2.2. Chemistry and electrochemistry nanoheterostructures and hybrid nanocomposites Purpose: Expected results:Release of new product: material Stage 1:1.1. Хімічний синтез наночастинок СdS в рідкокристалічної (РК) матриці. Створення гібридних РК нанокомпозитів. Хімічний та електрохімічний синтез наногетероструктур Pd в іон них розплавах. Електрохімічний синтез колоїдних частинок і плівок СdSe і WО3,.
1.2 Розробка методів синтезу нановуглецевих матеріалів на основі кисне- та азотовмісних комплексів 3-d металлів.
1.3 Розробка методів синтезу наноматеріалів з йонселективними, каталітичними та протонпровідними властивостями.
1.4 Термодинамічне обґрунтування складу електролітичної ванни та електродів для генерації вуглецевих наноструктур. Stage 2:2.1 Вивчення оптичних властивостей гібридних РК-нанокомпозитів з СdS. Розробка хімічних і електрохімічних способів одержання наногетероструктур Pt.Вивчення оптичних властивостей розчинів і плівок СdSe. Електрохімічний синтез наноструктурованих електрохромних плівок MoО3.
2.2 Дослідження нановуглецевих матеріалів. Розробка методів їх активації.
2.3 Розробка способів синтезу нанокомпозитів з йонселективними, каталітичними та протонпровідними властивостями
2.4 Вольтамперометричні вивчення механізму та кінетики катодного відновлення нано вуглецю з сольових розплавів. Stage 3:3.1 Хімічний синтез наночастинок СdSе в РК-матриці, оптимізація синтезу. Створення хімічних та електрохімічних методів синтезу нанокомпозитів Rh. Розробка методів введення наночастинок СdSe i WO3 у РК-матриці.
3.2 Структурні дослідження нановуглецевих матеріалів. Встановлення природи електрокаталітичних центрів на вуглецевих електрокаталізаторах.
3.3 Діагностика структури нанокомпозитів з йонселективними, каталітичними та протонпровідними властивостями
3.4 Вольтамперометричні дослідження анодного окиснення (СО2 та [СО3]2-) в хлоридних розплавах. Stage 4:4.1 Хімічний синтез наночастинок ZnS, ZnSe и PdS, PbSe в РК матриці на основі алканоатів металів, оптимізація умов синтезу в залежності від складу РК нанореактора, часу взаємодії та температури. Виготовлення й дослідження властивостей гетерофазних і планарних структур нанокристалічна плівка / РК.
4.2 Вивчення механізмів окиснення етанолу. Розробка електродів ПЕ на основі електрокаталізаторів.
4.3 Діагностика функціональних властивостей органонеорганічних нанокомпозитів.
4.4 Розробка параметрів синтезу вуглецевих наноматеріалів електролізом сольових розплавів. Stage 5:5.1 Дослідження оптичних характеристик гібридних РК нанокомпозитів та встановлення механізму запису голографічних граток. Визначення можливості використання електрохромного ефекту в наночастинках і плівках оксидів перехідних металів для створення оптичних РК наноструктур.
5.2 Проведення випробування стабільності вуглецевих наноматеріалів в часі.
5.3 Розробка наукових основ процесів за участю наноматеріалів з йонселективними, та протонпровідними властивостями.
5.4 Оптимізація умов електросинтезу вуглецевих нанокомпозитів з розплавів
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