Electrolytic production of silicon using liquid zinc alloy in molten CaCl2

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

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)H5049-H5056
    JournalJournal of the Electrochemical Society
    Volume164
    Issue number8
    DOIs
    Publication statusPublished - 2017 Jan 1

    Fingerprint

    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

    Cite this

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

    In: Journal of the Electrochemical Society, Vol. 164, No. 8, 01.01.2017, p. H5049-H5056.

    Research output: Contribution to journalArticle

    Yasuda, Kouji ; Shimao, Takeyuki ; Hagiwara, Rika ; Homma, Takayuki ; Nohira, Toshiyuki. / Electrolytic production of silicon using liquid zinc alloy in molten CaCl2 In: Journal of the Electrochemical Society. 2017 ; Vol. 164, No. 8. pp. H5049-H5056.
    @article{907b38ee15b64151814281f93474d988,
    title = "Electrolytic production of silicon using liquid zinc alloy in molten CaCl2",
    abstract = "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.",
    author = "Kouji Yasuda and Takeyuki Shimao and Rika Hagiwara and Takayuki Homma and Toshiyuki Nohira",
    year = "2017",
    month = "1",
    day = "1",
    doi = "10.1149/2.0121708jes",
    language = "English",
    volume = "164",
    pages = "H5049--H5056",
    journal = "Journal of the Electrochemical Society",
    issn = "0013-4651",
    publisher = "Electrochemical Society, Inc.",
    number = "8",

    }

    TY - JOUR

    T1 - Electrolytic production of silicon using liquid zinc alloy in molten CaCl2

    AU - Yasuda, Kouji

    AU - Shimao, Takeyuki

    AU - Hagiwara, Rika

    AU - Homma, Takayuki

    AU - Nohira, Toshiyuki

    PY - 2017/1/1

    Y1 - 2017/1/1

    N2 - 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.

    AB - 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.

    UR - http://www.scopus.com/inward/record.url?scp=85036474857&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85036474857&partnerID=8YFLogxK

    U2 - 10.1149/2.0121708jes

    DO - 10.1149/2.0121708jes

    M3 - Article

    AN - SCOPUS:85036474857

    VL - 164

    SP - H5049-H5056

    JO - Journal of the Electrochemical Society

    JF - Journal of the Electrochemical Society

    SN - 0013-4651

    IS - 8

    ER -