Electrolytic production of silicon using liquid zinc alloy in molten CaCl2

Kouji Yasuda, Takeyuki Shimao, Rika Hagiwara, Takayuki Homma, Toshiyuki Nohira

    研究成果: Article

    4 引用 (Scopus)

    抄録

    A new electrolytic production process for solar-grade Si has been proposed utilizing liquid Si–Zn alloy cathode in molten CaCl2. To establish this process, the behavior of liquid Zn metal in molten CaCl2 at 1123 K was investigated. Evaporation of Zn metal was largely suppressed by immersion in the molten salt, which enabled the use of a Zn electrode despite its high vapor pressure. Cyclic voltammetry results suggested that the reduction of SiO2 on a Zn cathode proceeded at a more negative than 1.45 V vs. Ca2+/Ca. After potentiostatic electrolysis at 0.9 V, Si particles with sizes of 2–30 μm were precipitated in the solidified Zn matrix by a slow cooling process. The rate-determining step for electrochemical reduction of SiO2 on the Zn cathode was discussed on the basis of a measurement of the alloying rate between solid Si and liquid Zn.

    元の言語English
    ページ(範囲)H5049-H5056
    ジャーナルJournal of the Electrochemical Society
    164
    発行部数8
    DOI
    出版物ステータスPublished - 2017 1 1

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    Zinc alloys
    Silicon
    Molten materials
    Cathodes
    Liquids
    Metals
    Vapor pressure
    Electrolysis
    Alloying
    Cyclic voltammetry
    Evaporation
    Salts
    Cooling
    Electrodes

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Renewable Energy, Sustainability and the Environment
    • Surfaces, Coatings and Films
    • Electrochemistry
    • Materials Chemistry

    これを引用

    Electrolytic production of silicon using liquid zinc alloy in molten CaCl2 . / Yasuda, Kouji; Shimao, Takeyuki; Hagiwara, Rika; Homma, Takayuki; Nohira, Toshiyuki.

    :: Journal of the Electrochemical Society, 巻 164, 番号 8, 01.01.2017, p. H5049-H5056.

    研究成果: Article

    Yasuda, Kouji ; Shimao, Takeyuki ; Hagiwara, Rika ; Homma, Takayuki ; Nohira, Toshiyuki. / Electrolytic production of silicon using liquid zinc alloy in molten CaCl2 :: Journal of the Electrochemical Society. 2017 ; 巻 164, 番号 8. pp. H5049-H5056.
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