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Evich Valer Vladislav Antipov - One of the best experts on this subject based on the ideXlab platform.

  • sn2 2xsbxfexo4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Yu S Vassiliev, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 solid solution were prepared by solid-state reaction in air at 1300 °C for 0.26 ≤ x ≤ 0.66. The crystal structure of the Sn2-2xSbxFexO4 phases was studied by electron diffraction and X-ray powder diffraction. The compounds crystallize with the rutile type structure with a disordered arrangement of cations (P42/mnm space group, a = 4.7127(6) A, c = 3.1595(4) A, RI = 0.020, RP = 0.019 for Sn1.48Sb0.26Fe0.26O4 and a = 4.6682(8) A, c = 3.1147(6) A, RI = 0.030, RP = 0.022 for Sn0.68Sb0.66Fe0.66O4). The valence state of cations in the Sn1.48Sb0.26Fe0.26O4 and Sn0.68Sb0.66Fe0.66O4 samples was determined by means of 119Sn, 121Sb, and 57Fe Mossbauer spectroscopy. The presence of Sn(II), Sb(III), or Fe(II) low valent state species was not detected in the samples. Resistivity vs temperature measurements revealed a semiconducting behavior from room temperature up to 900 °C with about four orders in magnitude decrease of the resistivity. Solubility tests in the cryolite-alumi...

  • Sn2-2xSbxFexO4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, S. Yu Vassiliev, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 Solid solution were prepared by solid-state reaction in air at 1300 degrees C for 0.26

Dihua Wang - One of the best experts on this subject based on the ideXlab platform.

  • electrochemical growth of a corrosion resistant multi layer scale to enable an oxygen evolution Inert Anode in molten carbonate
    Electrochimica Acta, 2018
    Co-Authors: Diyong Tang, Kaiyuan Zheng, Donald R Sadoway, Dihua Wang
    Abstract:

    Abstract An in-situ formed three-layered scale consisting of a Cu-rich layer and two oxide layers on the surface of Ni10Cu11Fe alloy enables an Inert Anode for oxygen evolution reaction in molten Na 2 CO 3 -K 2 CO 3 . The outermost layer is mostly NiFe 2 O 4 , the middle layer mainly consists of NiO, and the innermost is a Cu-rich metal layer. The dense NiFe 2 O 4 layer is resistant to molten salts and prevents O 2− diffusing inwards, the middle NiO layer conducts electrons and functions as a buffer layer to increase the mechanical robustness of the whole scale, and the third copper-rich layer could help to slow down the oxidation rate of the alloy. This low-cost Inert Anode with a multi-layered scale is able to survive for more than 600 h in molten Na 2 CO 3 -K 2 CO 3 electrolysis cell, generating O 2 and thereby enabling a carbon-free electrometallurgical process.

  • effects of applied voltage and temperature on the electrochemical production of carbon powders from co2 in molten salt with an Inert Anode
    Electrochimica Acta, 2013
    Co-Authors: Diyong Tang, Dihua Wang, Wei Xiao
    Abstract:

    Abstract With a SnO 2 Inert Anode, amorphous carbon powders were successfully deposited on a nickel cathode by electrochemical conversion of CO 2 in Li 2 CO 3 –Na 2 CO 3 –K 2 CO 3 eutectic melt in the temperature range of 450 °C to 650 °C and under the electrolysis voltages of 3.0 V to 6.0 V. The effects of electrolysis temperature and cell voltage on the morphology and structure of the produced carbon, and on the energy consumption of the process were systematically investigated. The morphologies and particle size of the carbon products were proven to be affected by the electrolysis cell voltage and temperature. As the electrolysis condition varied, the deposited carbon exhibited different forms, including nanoparticle, nanoflake, nanosheet and heart-shape nanostructured cage, etc. The particle sizes of the obtained carbon ranged from av. 2 μm to 50 nm, and smaller particles were obtained at higher cell voltage and lower electrolysis temperature. The carbon product obtained at 450 °C under 5.5 V exhibited the highest BET surface area of 868.3 m 2  g −1 . FTIR analysis demonstrated that oxygen-containing functional groups presented on the surface of the carbon product, which was most likely due to the active dangling bond on the carbon materials. The optimized energy consumption for producing 1 kg of carbon is as low as 35.59 kW h with a current efficiency of 87.86% at 450 °C under a constant cell voltage of 3.5 V.

  • 9 – Inert Anode Development for High-Temperature Molten Salts
    Molten Salts Chemistry, 2013
    Co-Authors: Dihua Wang, Wei Xiao
    Abstract:

    The development of Inert Anodes in molten salts remains the central focus for enhancing environmental viability and energy profitability of both the traditional Hall–Heroult process in the electrolytic aluminium industry and recently emerged novel molten-salt electrolysis technologies, including the FFC-Cambridge process and molten oxide electrolysis (MOE). Employing criteria and know how derived from the long-developed Hall–Heroult process, this chapter focuses on offering general guidance on the development of Inert Anodes, especially metallic-based materials in molten chlorides, by providing systematically thermodynamic considerations and experimental evaluations, aiming to accelerate the technological maturation of such novel molten-salt electrolysis processes. Attention is also paid to the development of Inert Anodes for other novel molten-salt electrolysis systems, namely, MOE and molten carbonate electrolysis.

  • reduction mechanism and carbon content investigation for electrolytic production of iron from solid fe2o3 in molten k2co3 na2co3 using an Inert Anode
    Journal of Electroanalytical Chemistry, 2013
    Co-Authors: Diyong Tang, Dihua Wang, Wei Xiao
    Abstract:

    Iron and oxygen was recently electrochemically prepared in molten Na2CO3-K2CO3 eutectic melt at 750 degrees C using a solid iron oxide pellet cathode and a cheap Ni10Cu11 Fe alloy Inert Anode. This paper focuses to reveal the detailed reduction kinetics of solid Fe2O3 in the melt and also the effect of reduction potential on the carbon content in the iron product. The reduction mechanism was systematically investigated by cyclic voltammetric measurements, potentiostatic electrolysis combining with the composition and morphology analysis of the products obtained at different potentials. It was found that the reduction of Fe2O3 involves three steps, with the formation of intermediate products, viz., NaFe2O3 and NaFeO2. The influence of electrolysis voltage/potential on the carbon content in the products was investigated by using both constant voltage and potentiostatic electrolysis under different conditions. The carbon content was found to be in the range of 0.035-0.76 wt.%, depending on the applied cathodic potential. The iron-based products with higher carbon content can be obtained upon electrolysis at a higher cell voltage or a more negative potential. The present results also demonstrated a controllable extraction of Fe-C steels with desired carbon content through an environmental friendly way. (C) 2012 Elsevier B.V. All rights reserved.

  • 9 Inert Anode development for high temperature molten salts
    Molten Salts Chemistry#R##N#From Lab to Applications, 2013
    Co-Authors: Dihua Wang, Wei Xiao
    Abstract:

    The development of Inert Anodes in molten salts remains the central focus for enhancing environmental viability and energy profitability of both the traditional Hall–Heroult process in the electrolytic aluminium industry and recently emerged novel molten-salt electrolysis technologies, including the FFC-Cambridge process and molten oxide electrolysis (MOE). Employing criteria and know how derived from the long-developed Hall–Heroult process, this chapter focuses on offering general guidance on the development of Inert Anodes, especially metallic-based materials in molten chlorides, by providing systematically thermodynamic considerations and experimental evaluations, aiming to accelerate the technological maturation of such novel molten-salt electrolysis processes. Attention is also paid to the development of Inert Anodes for other novel molten-salt electrolysis systems, namely, MOE and molten carbonate electrolysis.

V. A. Govorov - One of the best experts on this subject based on the ideXlab platform.

  • sn2 2xsbxfexo4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Yu S Vassiliev, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 solid solution were prepared by solid-state reaction in air at 1300 °C for 0.26 ≤ x ≤ 0.66. The crystal structure of the Sn2-2xSbxFexO4 phases was studied by electron diffraction and X-ray powder diffraction. The compounds crystallize with the rutile type structure with a disordered arrangement of cations (P42/mnm space group, a = 4.7127(6) A, c = 3.1595(4) A, RI = 0.020, RP = 0.019 for Sn1.48Sb0.26Fe0.26O4 and a = 4.6682(8) A, c = 3.1147(6) A, RI = 0.030, RP = 0.022 for Sn0.68Sb0.66Fe0.66O4). The valence state of cations in the Sn1.48Sb0.26Fe0.26O4 and Sn0.68Sb0.66Fe0.66O4 samples was determined by means of 119Sn, 121Sb, and 57Fe Mossbauer spectroscopy. The presence of Sn(II), Sb(III), or Fe(II) low valent state species was not detected in the samples. Resistivity vs temperature measurements revealed a semiconducting behavior from room temperature up to 900 °C with about four orders in magnitude decrease of the resistivity. Solubility tests in the cryolite-alumi...

  • Sn2-2xSbxFexO4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, S. Yu Vassiliev, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 Solid solution were prepared by solid-state reaction in air at 1300 degrees C for 0.26

M I Afanasov - One of the best experts on this subject based on the ideXlab platform.

  • sn2 2xsbxfexo4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Yu S Vassiliev, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 solid solution were prepared by solid-state reaction in air at 1300 °C for 0.26 ≤ x ≤ 0.66. The crystal structure of the Sn2-2xSbxFexO4 phases was studied by electron diffraction and X-ray powder diffraction. The compounds crystallize with the rutile type structure with a disordered arrangement of cations (P42/mnm space group, a = 4.7127(6) A, c = 3.1595(4) A, RI = 0.020, RP = 0.019 for Sn1.48Sb0.26Fe0.26O4 and a = 4.6682(8) A, c = 3.1147(6) A, RI = 0.030, RP = 0.022 for Sn0.68Sb0.66Fe0.66O4). The valence state of cations in the Sn1.48Sb0.26Fe0.26O4 and Sn0.68Sb0.66Fe0.66O4 samples was determined by means of 119Sn, 121Sb, and 57Fe Mossbauer spectroscopy. The presence of Sn(II), Sb(III), or Fe(II) low valent state species was not detected in the samples. Resistivity vs temperature measurements revealed a semiconducting behavior from room temperature up to 900 °C with about four orders in magnitude decrease of the resistivity. Solubility tests in the cryolite-alumi...

  • Sn2-2xSbxFexO4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, S. Yu Vassiliev, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 Solid solution were prepared by solid-state reaction in air at 1300 degrees C for 0.26

M. G. Rozova - One of the best experts on this subject based on the ideXlab platform.

  • sn2 2xsbxfexo4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Yu S Vassiliev, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 solid solution were prepared by solid-state reaction in air at 1300 °C for 0.26 ≤ x ≤ 0.66. The crystal structure of the Sn2-2xSbxFexO4 phases was studied by electron diffraction and X-ray powder diffraction. The compounds crystallize with the rutile type structure with a disordered arrangement of cations (P42/mnm space group, a = 4.7127(6) A, c = 3.1595(4) A, RI = 0.020, RP = 0.019 for Sn1.48Sb0.26Fe0.26O4 and a = 4.6682(8) A, c = 3.1147(6) A, RI = 0.030, RP = 0.022 for Sn0.68Sb0.66Fe0.66O4). The valence state of cations in the Sn1.48Sb0.26Fe0.26O4 and Sn0.68Sb0.66Fe0.66O4 samples was determined by means of 119Sn, 121Sb, and 57Fe Mossbauer spectroscopy. The presence of Sn(II), Sb(III), or Fe(II) low valent state species was not detected in the samples. Resistivity vs temperature measurements revealed a semiconducting behavior from room temperature up to 900 °C with about four orders in magnitude decrease of the resistivity. Solubility tests in the cryolite-alumi...

  • Sn2-2xSbxFexO4 solid solutions as possible Inert Anode materials in aluminum electrolysis
    Chemistry of Materials, 2005
    Co-Authors: V. A. Govorov, M. G. Rozova, A. G. Borzenko, S. Yu Vassiliev, V. M. Mazin, P. B. Fabritchnyi, M I Afanasov, Galina A. Tsirlina, Artemovich Maksim Abakumov, Evich Valer Vladislav Antipov
    Abstract:

    Single-phase samples of the Sn2-2xSbxFexO4 Solid solution were prepared by solid-state reaction in air at 1300 degrees C for 0.26