A. Novoselova

Institute of High Temprature Electrochemistry, Moskva, Moscow, Russia

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Publications (14)21.27 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This work presents the electrochemical study of lanthanum and uranium compounds in fused 3LiCl-2KCl eutectic vs. Cl−/Cl2 reference electrode in the temperature range 723–823 K on liquid gallium-indium eutectic alloy. Thermodynamics and the activity coefficients of lanthanum and uranium were studied. The separation factor of uranium from lanthanum on gallium-indium eutectic alloy was determined.
    Electrochimica Acta 11/2014; 145:81–85. · 4.09 Impact Factor
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    ABSTRACT: This work presents the electrochemical study of neodymium and uranium compounds in fused LiCl-KCl eutectic vs. Cl-/Cl2 reference electrode in the temperature range 723-823 K on liquid gallium-indium eutectic alloy. The activity, solubility and the activity coefficients of neodymium were calculated. The separation factor of uranium from neodymium on gallium-indium eutectic alloy was determined. The obtained data show the perspective of used this system in future innovation method for recovery of nuclear waste.
    Electrochimica Acta 07/2014; 133:354–358. · 4.09 Impact Factor
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    Recent Trend in Electrochemical Science and Technology, 01/2012; , ISBN: 978-953-307-830-4
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    Mass Transfer - Advanced Aspects, 07/2011; , ISBN: 978-953-307-636-2
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    ABSTRACT: This work presents the electrochemical study of Cm(III) in fused 3LiCl–2KCl eutectic in the temperature range 723–923K. Transient electrochemical techniques such as cyclic, square wave voltammetries, and chronopotentiometry have been used in order to investigate the reduction mechanism of curium ions up to metal. The results obtained show that the reduction reaction takes place in a single step Cm(III)+3e¯⇒Cm(0). The diffusion coefficient of Cm3+ ions was determined by cyclic voltammetry at different temperatures by applying Berzins–Delahay equation. The validity of the Arrhenius law was also verified and the activation energy for diffusion was found to be 28.21kJmol−1. The apparent standard electrode potential of the redox couple Cm(III)/Cm(0) was found by chronopotentiometry at several temperatures. The thermodynamic properties of curium trichloride have also been calculated.
    Journal of Electroanalytical Chemistry - J ELECTROANAL CHEM. 01/2011; 651(1):67-71.
  • A. Novoselova, V. Smolenski
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    ABSTRACT: This work presents the results of a study of the Tm3+/Tm2+ and Yb3+/Yb2+ couple redox potentials vs. Cl–/Cl2 reference electrode at the temperature range (823 to 973)K in fused NaCl–KCl–CsCl eutectic by direct potentiometric method. Initial concentrations of TmCl3 and YbCl3 in solvents did not exceed 5.0mol%. Basic thermodynamic properties of the reactions TmCl2(l)+½ Cl2(g)⇔TmCl3(l) and YbCl2(l)+½ Cl2(g)⇔YbCl3(l) were calculated using the temperature dependencies of apparent standard potentials of the couples ETm3+/Tm2+∗ and EYb3+/Yb2+∗.
    Journal of Chemical Thermodynamics - J CHEM THERMODYN. 01/2011; 43(7):1063-1067.
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    ABSTRACT: This work presents the electrochemical study of Cm(III) in fused NaCl–2CsCl eutectic in the temperature range 823–1023 K. Transient electrochemical techniques such as cyclic, differential pulse and square wave voltammetry, and chronopotentiometry have been used in order to investigate the reduction mechanism of curium ions up to the metal. The results obtained show that the reduction reaction takes place in a single step . The diffusion coefficient of [CmCl6]3- complex ions was determined by cyclic voltammetry at different temperatures by applying the Berzins–Delahay equation. The validity of the Arrhenius law was also verified and the activation energy for diffusion was found to be 44.46 kJ/mol. The apparent standard electrode potential of the redox couple Cm(III)/Cm(0) was found by chronopotentiometry at several temperatures. The thermodynamic properties of curium trichloride have also been calculated.
    Journal of Nuclear Materials 01/2010; 396(1):102-106. · 2.02 Impact Factor
  • A. Novoselova, V. Smolenski
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    ABSTRACT: This work presents the results of a study of the Tm3+/Tm2+ and Yb3+/Yb2+ couple redox potentials vs. Cl−/Cl2 reference electrode at the temperature range (973 to 1123)K in molten CsCl by direct potentiometric method. Initial concentrations of TmCl3 and YbCl3 in solvents did not exceed 5.0mol%. Basic thermodynamic properties of the reactions TmCl2(l)+1/2Cl2(g)⇔TmCl3(l) and YbCl2(l)+1/2Cl2(g)⇔YbCl3(l) were calculated using the temperature dependencies of apparent standard potentials of the couples ETm3+/Tm2+∗ and EYb3+/Yb2+∗.
    Journal of Chemical Thermodynamics - J CHEM THERMODYN. 01/2010; 42(8):973-977.
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    ABSTRACT: This work presents the influence of electrode material nature on the mechanism of cathodic reduction of ytterbium (III) ions in fused NaCl–KCl–CsCl eutectic at the temperature range 723–1073K. Transient electrochemical techniques such as linear sweep, cyclic, semi-integral and square wave voltammetry, and potentiometry at zero current have been used in order to investigate the reduction mechanism of ytterbium ions on inert and active working electrodes, transport parameters and thermodynamics properties of the ytterbium compounds. The influence of the material of working electrode on the mechanism of the cathode process was determined. The results obtained show that the reduction reaction Yb(III)+e¯⇔Yb(II) on W electrode is reversible being controlled by the rate of the mass transfer. The diffusion coefficient of [YbCl6]3- complex ions was calculated at different temperatures and the apparent standard electrode potential of the soluble–soluble redox system Yb3+/Yb2+ was obtained. The reduction reaction of ytterbium (III) ions on Al active electrode was investigated. Al2Yb and Al3Yb alloys are formed during the polarization on the surface of working electrode.
    Journal of electroanalytical chemistry 08/2009; 633(2):291-296. · 2.67 Impact Factor
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    ABSTRACT: This work presents the electrochemical study of YbCl3 in molten CsCl in the temperature range 973–1073K. Transient electrochemical techniques have been used in order to investigate the reduction mechanism, transport parameters and thermodynamics properties of the reaction YbCl2+1/2Cl2=YbCl3. The results obtained show that the reduction reaction Yb(III)+e¯⇔Yb(II) is reversible being controlled by the rate of the mass transfer. The diffusion coefficient of [YbCl6]3- complex ions was determined. The apparent standard electrode potential of the soluble–soluble redox system Yb3+/Yb2+ was obtained by cyclic voltammetry.
    Journal of Nuclear Materials 03/2009; 385(1):184-185. · 2.02 Impact Factor
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    ABSTRACT: This work presents the electrochemical study of Yb(III) ions in molten alkali metal chlorides in the temperature range 723–1073 K. Transient electrochemical techniques such as linear sweep, cyclic and square wave voltammetry, and potentiometry at zero current have been used to investigate the reduction mechanism, transport parameters and thermodynamic properties of the reaction YbCl2 + 1/2Cl2 = YbCl3 The results obtained show that the reduction reaction Yb(III) + e− ⇔ Yb(II) is reversible being controlled by the rate of the mass transfer. The diffusion coefficient of [YbCl6]3− complex ions has been determined at different temperatures in the fused eutectic LiCl–KCl, the equimolar NaCl–KCl and the CsCl media. The apparent standard potential of the soluble–soluble redox system Yb(III)/Yb(II) has been obtained by cyclic voltammetry. The influence of the nature of the solvent on the electrochemical and thermodynamic properties of ytterbium compounds is discussed.
    Electrochimica Acta 12/2008; 54(2):382-387. · 4.09 Impact Factor
  • V. Smolenski, A. Novoselova
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    ABSTRACT: This work presents the electrochemical study of TmCl3 solutions in NaCl–2CsCl eutectic at the temperature range 823–973 K using inert and reactive electrodes, i.e. Mo and Al, respectively. On an inert electrode, Tm3+ ions are reduced to metallic thulium through two consecutive steps: Tm3+ + e− → Tm2+ and Tm2+ + 2e− → Tm. The electroreduction of Tm3+ to Tm2+ ions was found to be reversible at low scan rates being controlled by the rate of the mass transfer and irreversible at high scan range (>0.1 V s−1) being controlled by the rate of charge transfer.The diffusion coefficient of [TmCl6]3− complex ions was determined at different temperatures. Arrhenius law was verified by plotting the variation of the logarithm of the diffusion coefficient vs. reverse temperature. The apparent standard potential of the soluble-soluble redox system Tm3+/Tm2+ was obtained by cyclic voltammetry.The electrode reactions of Tm3+ solutions at an Al electrode were also investigated. The results showed that for the extraction of thulium from molten chlorides, the use of a reactive electrode made of aluminum leading to Al–Tm alloys seems to be a pertinent route.
    Electrochimica Acta. 63:179–184.
  • A. Novoselova, V. Smolenski
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    ABSTRACT: This work presents the results of a study of the Tm3+/Tm2+ couple redox potentials vs. Cl–/Cl2 reference electrode at the temperature range (833 to 1073) K in molten equimolar NaCl–KCl and NaCl–2CsCl eutectic by direct potentiometric method. Initial concentrations of TmCl3 in solvents did not exceed 5.0 mol%. Apparent standard redox potentials of the couples ETm3+/Tm2+∗ were determined in different solvents. Basic thermodynamic properties of the reaction TmCl2(l)+1/2Cl2(g)⇔TmCl3(l)TmCl2(l)+1/2Cl2(g)⇔TmCl3(l) were calculated. The dependence between the apparent standard redox potentials of the couples ETm3+/Tm2+∗ and the ionic potential of the solvents was established.
    The Journal of Chemical Thermodynamics 48:140–144. · 2.30 Impact Factor
  • A. Novoselova, V. Smolenski
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    ABSTRACT: This work presents the electrochemical study of NdCl3 solutions in fused low-melting LiCl–KCl–CsCl eutectic and individual CsCl at the temperature range 573–943 K using inert molybdenum electrodes. The mechanism of the electrochemical reduction was investigated by transient electrochemical technique. It has been shown that Nd3+ ions are reduced to metallic neodymium through two consecutive steps: Nd3+ + ē → Nd2+ and Nd2+ + 2ē → Nd0.The chemical stability of Nd2+ ions in fused chloride melts was studied at different temperatures. It was determined that the compound NdCl2 is not stable in molten solutions at high temperatures (above 810–840 K).The results of a study of the Nd3+/Nd2+ couple redox potentials vs. Cl−/Cl2 reference electrode at a wide temperature range in molten LiCl–KCl–CsCl eutectic was carried out by direct potentiometric method. Apparent standard redox potentials of the couple ENd3+/Nd2+* were determined. Basic thermodynamic properties of the reaction NdCl2(l) + ½Cl2(g) ⇔ NdCl3(l) were calculated.
    Electrochimica Acta. 87:657–662.