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Zr4+/F~– co-doped TiO2(anatase) as high performance anode material for lithium-ion battery

Progress in Natural Science:Materials International 2018年第5期28卷 542-547页

作者： Denis P.Opra Sergey v.Gnedenkov Sergey L.Sinebryukhov Elena I.voit Alexander A.Sokolov Alexander Yu.Ustinov veniamin v.zheleznov Institute of Chemistry Far Eastern Branch of Russian Academy of Sciences Far Eastern Federal University

Zr4+and F~– co-doped TiO2with the formula of Ti0.97Zr0.03O1.98F0.02was facilely synthesized by a sol-gel template *** crystal structure,morphology,composition,surface area,and conductivity were characterized by Raman spectroscopy,energy-dispersive X-ray analysis,scanning electron microscopy,Brunauer-Emmett-Teller measurements,X-ray photoelectron spectroscopy,and electrochemical impedance *** results demonstrate that Zr4+and F~–homogeneously incorporated into TiO2,forming solid solution with an anatase ***0.97Zr0.03O1.98F0.02shows outstanding electrochemical properties as Li-ion battery anode in comparison with *** particular,upon 35-fold cycling at 1C-rate Zr4+/F~–co-doped TiO2delivers a reversible capacity of 163 mAh g–1,whereas Zr4+-doped TiO2gives only 34 mA h g–***,Zr4+/F~–co-doped TiO2retains a capacity of 138 mA h g–1during cycling even at 10 *** enhance performance originates from improved conductivity of Zr4+/F~–co-doped TiO2material through generation of Ti3+(serving as electron donors)into the crystal lattice and,possibly,due to F-doping blocked the anode surface from attack of HF formed as electrolyte decomposition product.

关键词： Li-ion batteries TiO2(anatase) Anode Co-doping Sol-gel template Process Electrochemical performance

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Characterization and Electrochemical Properties of Nanostructured Zr-Doped Anatase TiO_2 Tubes Synthesized by Sol–Gel Template Route

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Journal of Materials Science & Technology 2017年第6期33卷 527-534页

作者： Denis P.Opra Sergey v.Gnedenkov Sergey L.Sinebryukhov Elena I.voit Alexander A.Sokolov Evgeny B.Modin Anatoly B.Podgorbunsky Yury v.Sushkov veniamin v.zheleznov Institute of Chemistry Far Eastern Branch of Russian Academy of Sciences Far Eastern Federal University National Research Centre "Kurchatov Institute"

A series of nanostructured Zr-doped anatase TiO_2 tubes with the Zr/Ti molar ratio of 0.01, 0.02, 0.03, and0.09 were prepared by a sol–gel technology on a carbon fiber template. The electrochemical performance of Zr-doped anatase TiO_2 as anodes for rechargeable lithium batteries was investigated and compared with undoped titania. Tests represented that after 35-fold charge/discharge cycling at C/10 the reversible capacity of Zr-doped titania（Zr/Ti = 0.03） reaches 135 m A h g^（-1）, while the capacity of undoped titania（Zr/Ti = 0） yielded only 50 m A h g^（-1）. Based on the results of the physicochemical investigation, three reasons of improving electrochemical performance of Zr-doped titania were suggested. According to the scanning electron microscopy and transmission electron microscopy, Zr^（4＋） doping induces a decrease in nanoparticle size, which facilitates the Li＋diffusion. The Raman investigations show the more open structure of Zr-doped TiO_2 as compared to undoped titania due to changing of the unit cell parameters, that significantly affects on the reversibility of the insertion/extraction process. The electrochemical impedance spectroscopy results indicate that substitution of Zr^（4＋） for Ti^（4＋） into anatase TiO_2 has favorable effects on the conductivity.

关键词： Li-ion batteries Anatase titania Nanostructured materials Sol–gel template process Doping Electrochemical performance

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Nonstationary plane contact problem in theory of elasticity for conformal cylindrical surfaces

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Acta Mechanica Solida Sinica 2017年第2期30卷 190-197页

作者： veniamin D.Kubenko Ihor v.Yanchevskyi S.P.Tymoshenko Institute of Mechanics of National Academy of Science of Ukraine 3 Nesterova Str.Kyiv 03057Ukraine National Technical University of Ukraine"Kyiv Polytechnic Institute" 37 Peremohy Ave.Kyiv 03056Ukraine

A numerical–analytical approach is described to investigate the process of impact interaction between a long smooth rigid body and the surface of a circular cylindrical cavity in elastic space. A non-stationary mixed initial boundary value problem is formulated with a priori unknown boundaries moving with variable velocity. The problem is solved using the methods of the theory of integral transforms, expansion of desired variables into a Fourier series, and the quadrature method to reduce the problem to solving a system of linear algebraic equations at each time step. Some concrete numerical computations are *** cylindrical body mass and radius impact on the proile of the transient process of contact interaction has been analysed.

关键词： Non-stationary mixed problem Cylindrical cavity in elastic medium Rigid body Contact interaction Fourier expansion

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Application of Coulometric Titration for the Certification of Primary Reference Materials of Pure Substances

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American Journal of Analytical Chemistry 2014年第9期5卷 559-565页

作者： Gennady I. Terentiev Alena v. Sobina Alexandr J. Shimolin veniamin M. Zyskin Ural Scientific and Research Institute for Metrology Ekaterinburg Russia

In this article, the block scheme and metrological characteristics of the State primary standard of the mass (molar) fraction and mass (molar) concentration of the component in the liquid and solid substances and materials based on coulometric titration GET 176-2010 are given. Primary reference materials certified by coulometric titration in the Ural Scientific and Research Institute for Metrology include eight certified reference materials (CRMs) of pure solid substances (mostly salts of sodium or potassium) and one hydrochloric acid solution CRM. The metrological characteristics of these reference materials and the scheme of their application in titrimetric analysis are shown. The expanded uncertainty of the certified value (mass fraction for the solid substances or molar concentration for the solution) is in the range from 0.018% to 0.05%. Information about two primary reference materials of high purity iron and lead nitrate certified by controlled-potential coulometry with expanded uncertainty from 0.04% to 0.07% is also given.

关键词： Coulometric Titration Controlled-Potential Coulometry Primary Reference Materials High Purity Substances State Primary Standard

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Low Temperature Transport Properties of Multigraphene Structures on 6H-SiC Obtained by Thermal Graphitization： Evidences of a Presence of Nearly Perfect Graphene Layer

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材料科学与工程（中英文A版） 2013年第11期3卷 757-762页

作者： Alexander A. Lebedev Nina v. Agrinskaya vyacheslav A. Beresovets veniamin I. Kozub Sergei P.Lebedev Alia A. Sitnikova A. F. loffe Institute Russian Academy of Sciences Saint Petersburg 194021 Russia National Research University of Information Technologies Mechanics and Optics Saint-Petersburg 197101 Russia International Laboratory of High Magnetic Fields and Low Temperatures Wroclaw 53421 Poland

Transport properties of multigraphene layers on 6H-SiC substrates fabricated by thermal graphitization of SiC were studied. The principal result is that these structures were shown to contain a nearly perfect graphene layer situated between the SiC substrate and multgraphene layer. It was found that the curves of magnetoresistance and Shubnikov- de Haas oscillations shown the features, typical for single-layered graphene. The low temperature resistance demonstrated an increase with temperature increase, which also corresponds to a behavior typical for single-layered graphene (antilocalization). However, at higher temperatures the resistance decreased with an increase of temperature, which corresponds to a weak localization. We believe that the observed behavior can be explained by a parallel combination of contributions to the conductivity of single-layered graphene and of multigraphene, the latter allowing to escape damages of the the graphene by atmosphere effect.

关键词： 6H-SiC 石墨化耐低温输运性质结构证据高温度传输性能

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