A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt

Toshiyuki Nohira, Akifumi Ido, Takeyuki Shimao, Xiao Yang, Kouji Yasuda, Rika Hagiwara, Takayuki Homma

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    Electrolytic production process for solar-grade Si utilizing liquid Si-Zn alloy cathode in molten CaCl2 has been proposed. Toward the establishment of the process, the behavior of liquid Zn metal was investigated in molten CaCl2 at 1123 K. The evaporation of Zn metal was largely suppressed by an immersion into molten salt, which enables the use of Zn electrode in spite of the high vapor pressure of Zn. The cyclic voltammetry suggested the reduction of SiO2 at 1.45 V vs. Ca2+/Ca on a Zn cathode. After the potentiostatic electrolysis at 0.9 V, Si particles with diameters of 2-30 μm were precipitated in the solidified Zn matrix by the slow cooling process of the produced liquid Si-Zn alloy. The alloying rate between solid Si and liquid Zn was measured as 4.56 μm s-1, and it linearly decreased with the Si content in liquid Zn phase.

    Original languageEnglish
    Title of host publicationMolten Salts and Ionic Liquids 20
    PublisherElectrochemical Society Inc.
    Pages17-33
    Number of pages17
    Volume75
    Edition15
    ISBN (Electronic)9781607685395
    DOIs
    Publication statusPublished - 2016
    EventSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting - Honolulu, United States
    Duration: 2016 Oct 22016 Oct 7

    Other

    OtherSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting
    CountryUnited States
    CityHonolulu
    Period16/10/216/10/7

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Nohira, T., Ido, A., Shimao, T., Yang, X., Yasuda, K., Hagiwara, R., & Homma, T. (2016). A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. In Molten Salts and Ionic Liquids 20 (15 ed., Vol. 75, pp. 17-33). Electrochemical Society Inc.. https://doi.org/10.1149/07515.0017ecst