Liudmila Yolshina

Liudmila Yolshina
Russian Academy of Sciences | RAS · Institute of high Temperature Electrochemistry

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About

53
Publications
8,355
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405
Citations
Citations since 2016
30 Research Items
354 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
January 2015 - present
Institute of High Temprature Electrochemistry
Position
  • Principal Investigator

Publications

Publications (53)
Article
Full-text available
The development of novel methods for industrial production of metal-matrix composites with improved properties is extremely important. An aluminum matrix reinforced by “in situ” α-Al2O3 nanoparticles was fabricated via direct chemical reaction between molten aluminum and rutile TiO2 nanopowder under the layer of molten salts at 700–800 °C in air at...
Article
Density, viscosity and specific conductivity of 1-ethyl-3-methylimidazolium and 1-butyl-3-methylimidazolium chloroaluminate ILs (AlCl3–[EMIm]Cl and AlCl3–[BMIm]Cl) are systematically measured for the compositions with the molar ratio of aluminum chloride to the organic salt (N) from 0.8 to 2.0 and at temperatures from 273 to 373 K. Additivity of th...
Article
Full-text available
The structure and mechanical properties of composites consisting of a metal matrix based on aluminum and its alloys of different compositions (AA-3003 and AA-5154) and graphene synthes sized in situ under a layer of molten salts were investigated depending on the chemical composition and grain size of the matrix. Aluminum matrix composites of three...
Article
In this work, a versatile synthetic protocol for obtaining of new promising carbon materials based on the C-C coupling of graphenide lithium species with azaaromatic compounds (1,10-phenanthroline, phenyl-1,2,5-oxadiazolo[3,4-b]pyrazine) has been suggested. It was shown that more electrophilic oxadiazolopyrazine gave the product with high degree of...
Article
The mechanism of aluminum electrodeposition from acidic 1-butyl-3-methylimidazolium chloride chloroaluminate ionic liquids ([BMIm]Cl ILs) is studied over a wide range of the molar ratio of AlCl3 to [BMIm]Cl (N) at 30 °C. The findings for AlCl3–[BMIm]Cl and AlCl3–1-ethyl-3-methylimidazolium chloride ([EMIm]Cl) are analysed and compared in order to i...
Article
Full-text available
A hierarchically structured carbon film (HSC) synthesised during glucose interaction with a halide melt on a molten magnesium catalyst at temperatures is composed of sp, sp², and sp³ hybridised carbon atoms as well as carbonyl and carboxyl functional groups according to X-ray photoelectron spectroscopy. The hierarchically structured carbon film red...
Article
The hierarchical structured carbon flakes (HSCF) consisting of sp-, sp²- and sp³-hybridised carbon with highly evolved crystal structure on one side and smooth on the other side synthesised. XRD and photoelectron spectroscopy studies reveal that annealing in the air up to the temperature of 450 °С brings about a decrease in the content of sp³-hybri...
Article
The synthesis of Na2Ti6O13 nanowires (NTNW) was performed at chemical interaction between rutile nanopowder with sodium chloride flux on the surface of molten aluminum under air. Synthesis of NTNW proceeds at two stages reaction at the three-phase boundary “gaseous medium (air)/molten salt/molten metal (Al)” under the quasi-autocatalytic mechanism....
Article
The mechanism of aluminium reduction in 1-ethyl-3-methylimidazolium chloride/chloroaluminate ionic liquids has been investigated. Stationary polarisation curves for aluminium electrode in 1-ethyl-3-methylimidazolium chloride chloroaluminate ionic liquid are S-shaped and contain limiting current plateau sections, which indicates heterogeneous kineti...
Article
Transport numbers in the basic AlCl3–1-butyl-3-methylimidazolium chloride ionic liquid with varying mole fraction of aluminium chloride were determined by a modified Hittorf method at 33 oC. The change in the composition of the ionic liquid was established by Raman spectroscopy and by studying the variation in the conductivity of the electrolyte in...
Article
Full-text available
Currently, aluminum-ion batteries are considered attractive energy storage devices because aluminum is an inexpensive, widely available, environmentally friendly, low-flammable, and high recyclable electrode material. Electrochemical cell simulating the work of an aluminum-ion battery with aluminum-graphene nanocomposite–negative electrode, positiv...
Article
The paper presents a series of studies into the physicochemical properties such as density, viscosity and conductivity of acidic AlCl3–1-ethyl-3-methylimidazolium chloride ionic liquid (IL) at 30 °C. The ionic composition of the electrolyte is characterised by Raman spectroscopy. A study of the dependence of the ionic liquid specific conductivity o...
Article
The method of high-resolution scanning and transmission electron microscopy was used to investigate the features of the formation of the structure and deformation behavior of a composite material based on aluminum with microadditions of graphene under severe plastic deformation by the dynamic channel-angular pressing method. It was found that an al...
Article
Abstract A study of graphene “in situ” formed during the chemical interaction of glucose with molten aluminium under a layer of molten alkaline halides in air at temperatures of 750–850�C is presented. By means of Raman and X-ray photoelectron spectroscopy and electron microscopy, it is shown that graphene films synthesize in the aluminium. The num...
Article
The first example of chloroaluminate ionic liquids (ILs) analogues based on amides of fluorinated carboxylic acids, namely 1-trifluoroacetyl piperidine (TFAP), has been described. The possibility of applying of this electrolytes has been experimentally evaluated in the series TFAP/AlCl3; TFAP/LiCl/AlCl3; TFAP/[EMIm]Cl/AlCl3; [EMIm]Cl/AlCl3 for use...
Article
Full-text available
A fracture locus for a 1 wt% aluminum-graphene metal matrix composite is obtained from experiments at 300°C. The fracture locus determines a functional dependence of ultimate metal ductility on the stress state characteristics. Tensile tests of smooth cylindrical specimens, notched cylindrical specimens, bell-shaped specimens and tests on conventio...
Article
Full-text available
Migration of graphene fragments along the aluminum matrix in the solid phase was studied by molecular dynamics. The structure of the Al–C nanocomposite grain was studied by statistical geometry. The distributions of the topological and metric characteristics of truncated polyhedra were calculated for the Al subsystem; the distributions for the poly...
Article
Full-text available
Deformation behavior of a 2 wt% aluminum-graphene metal matrix composite (MMC) at 300 °C is studied. The MMC under study is synthesized at the Institute of High-Temperature Electrochemistry, Ural Branch of RAS. Data on ultimate ductility of the MMC is obtained. The value of shear strain to fracture is used as the characteristic of ultimate ductilit...
Conference Paper
Full-text available
The main requirements to the up-to-date batteries are high specific energy, high specific power, long life and weight reduction. Lead-acid battery efficiency and long life improvement still stay one of the important problems for both scientists and industrials. One of the most prominent way to get better results is the changing of materials electro...
Article
A novel carbon structure is synthesised during the interaction of solid organic precursors as D-glucose with a molten metallic zinc catalyst under a layer of molten alkali chlorides at air atmosphere. Scanning electronic microscopy studies show that the formed pure carbon film is non-isomorphic and smooth on one side, but highly evolved, with squar...
Article
Full-text available
The mechanism of formation of ceramic microparticles (alumina) and graphene in a molten aluminum matrix is studied as a function of the morphology and type of precursor particles, the temperature, and the gas atmosphere. The influence of the composition of an aluminum composite material (as a function of the concentration and size of reinforcing pa...
Article
The behavior of graphene fragments in the structural fcc grains of aluminum was studied by molecular dynamics. In the course of structural relaxation, the graphene sheets united, twisted, and shifted toward the grain boundaries. The structure of the formed nanocomposite grain was studied in detail by statistical geometry. The distributions of Voron...
Conference Paper
Full-text available
A novel method of creating new lightweight aluminum-metallic composite materials in halide melts at temperatures of 973–1073 К in air atmosphere is proposed. The method for synthesizing aluminum-based metallic composite materials containing up to 2 wt. % graphene sheets uniformly distributed in a metal matrix is entirely new, having no analogies in...
Article
A novel method of creating new lightweight, aluminum-metallic, composite materials under halides melt at temperatures 973e1073 К under air atmosphere is proposed. The method for synthesizing aluminum-based metallic composite materials, containing up to 2 wt. % graphene sheets uniformly distributed in a metal matrix, is entirely new, having no analo...
Article
Novel lead-graphene and lead-graphite metallic composites which melt at temperature of the melting point of lead were investigated as possible positive current collectors for lead acid batteries in sulfuric acid solution. Scanning electron microscopy, Raman spectroscopy, difference scanning calorimetry, cyclic voltammetry and prolonged corrosion te...
Article
Full-text available
The corrosion-electrochemical behavior of titanium in a molten eutectic mixture of cesium and sodium chlorides containing up to 1 wt % boron oxide is studied in the temperature range 810–870 K in an argon atmosphere. The potential, the current, and the rate of titanium corrosion are determined. The optimum conditions of forming a dense continuous t...
Article
Full-text available
The corrosion-electrochemical behavior of aluminum is studied in a chloride-nitrate melt containing 50 wt % eutectic mixture of cesium and sodium chlorides and 50 wt % sodium nitrate in the temperature range 790–900 K in an argon atmosphere.
Article
Dense protective layers of aluminium corrosion products, whose composition depends on the oxidation temperature, are formed on the surface of aluminium treated with high-temperature pulsed plasma (HTPP) without visible remelting and then held in a chloride–nitrate melt in conditions of anodic polarization. Modification of aluminium treated with HTP...
Article
Full-text available
The corrosion-electrochemical behavior of titanium in a chloride melt containing 1–30 wt % sodium nitrate at a temperature of 790–900 K in an argon atmosphere is studied. Depending on the sodium nitrate content, either oxide layers of various structures can appear on the titanium surface or titanium dioxide nanopowder can form in the bulk of the me...
Article
The mechanism of electroless deposition of lead and zinc and their codeposition on an aluminum substrate in a chloride electrolyte melt at temperatures below the melting point of aluminum has been studied. It is shown that lead forms a dense thick (up to 60μm) porousless layer on aluminum during the contact exchange, whereas zinc coatings are not m...
Article
Full-text available
The effect of high-temperature pulsed plasma (HTPP) on the corrosion-electrochemical behavior of titanium in a molten eutectic mixture of cesium and sodium chlorides in an argon atmosphere at temperatures of 790–810 K is studied. Upon the HTPP treatment in an oxygen or helium environment, a modified corrosion-resistant layer with a thickness up to...
Article
In course of anodic oxidation of lead in chloride–nitrate melt it has been formed β-PbO either in the form of nanopowder with the average size of the particles 20–70nm or in the form of nanofibers with the thickness of 20 nanometers and length 500nm. Synthesis is easily reproduced and can become a basis of industrial production lead nano-oxide. Lea...
Article
An electrochemical method is proposed for preparing metal (aluminum, titanium, tantalum, zirconium) oxides with a high affinity to oxygen in a chloride-nitrate melt at temperatures above 830 K in an argon atmosphere. It is demonstrated that either dense metal oxide layers firmly bonded to the metal base can be produced or large amounts of nanosized...
Article
Full-text available
The interaction of titanium, zirconium, and aluminum nitrides with a mixture of fused alkali-metal chlorides with lead chloride at 870–1070 K is studied. It is shown that as a result of the contact exchange interaction, which occurs in no more than 5 h, a large fraction of the powdered nitrides transforms into a soluble state, and lead precipitates...
Article
Full-text available
We studied the feasibility of synthesizing ultrafine oxide powders by anodic oxidation of metals, such as zirconium and tantalum, in chloride + nitrate melts at temperatures above 830K. We showed that, varying the electrolyte composition, oxidation temperature, and anodic current density, one obtains either compact protective coatings on the specif...
Article
At the oxidation of zirconium in molten salts up to 813–1073 K, the growth of oxide phases is found to proceed chiefly due to the diffusion of oxygen ions via the oxide film toward the metal-oxide interface. An oxide film formed in the initial period of zirconium oxidation in a chloride-nitrate melt decelerates the process but does not prevent the...
Conference Paper
Investigations have been carried out on the deposition of compact uniform and continuous lead layers on the surfaces on aluminum and copper nets. No defects in lead layer were studied by scanning tunnel microscopy. The lead film electrodes on the copper and aluminum nets feature good electrochemical and corrosion characteristics
Article
Compact lead layers have been deposited on the surfaces of aluminium and aluminium alloys. These coatings are uniform in thickness and have high porosity. The lead–film electrode produced on aluminium plate can be used as the positive electrode in a lead–acid battery.
Article
The corrosion-electrochemical behavior of the aluminum that was preliminarily treated with high-temperature plasma pulses in hydrogen, helium, or oxygen was studied. The composition and properties of the modified surface layers we re investigated by means of raster electron microscopy, Auger spectrometry, and X-ray diffractometry.
Article
Investigations have been carried out on the deposition of compact lead layers on the surfaces of various metallic substrates. It is shown that the lead coatings so obtained are non-uniform in thickness and feature high porosities. The lead-film electrode thus produced on the surface of a fine copper grid can be used as a positive electrode in the l...
Article
A problem of formation of aluminum protective coating on steel surface is considered. Feasibility of interaction of aluminum and aluminized steel (Kh18N10T) with chloride-nitrate fused mixture (CsCl-NaCl-NaNO3) at considerably higher temperature than 673 K is investigated. Forming the corrosion-resistant coating on aluminum in fused chloride, conta...

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Project (1)
Project
The corrosion-electrochemical behavior of aluminum-graphene and aluminum-graphite metallic composites in 3.0 % NaCl solution studies by using microstructure examination, potentiodynamic polarization, chronoamperometry, electron impedance spectroscopy, cyclic voltammetry, and prolonged corrosion test. Structure and morphology of aluminum-graphene and aluminum-graphite composites so as corrosion-interaction products studies by means of scanning electron microscopy (SEM), photoelectron spectroscopy (XPS), Raman spectroscopy and X-ray diffraction (XRD). Aluminum-graphene and aluminum-graphite composites forms by chemical interaction of carbides with liquid aluminum under the layer of molten halides. Graphene and graphite presence in aluminum matrix confirms by Raman spectroscopy. Corrosion potential of aluminum-graphene composite is 200-300 mV more negative and of aluminum-graphite composites 100-150 mV more positive relating to initial aluminum correlating with carbon concentration. Aluminum-graphene metallic composites show the highest electrochemical activity and uniform corrosion. Corrosion rate of both aluminum-carbon composites rises with the increasing of graphene and graphite concentration as to initial aluminum. The only corrosion products after prolonged corrosion of aluminum-graphene composite in NaCl solution is AlO determined by XRD. Aluminum-graphene composite successfully cycles during 100 cycles with 12% delay of current densities. No alumina forms at anode chronoamperometry during 24 h. It makes aluminum-graphene composite anodes the most promising candidate for creating next generation batteries.