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

    研究成果: Conference contribution

    2 引用 (Scopus)

    抜粋

    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.

    元の言語English
    ホスト出版物のタイトルMolten Salts and Ionic Liquids 20
    出版者Electrochemical Society Inc.
    ページ17-33
    ページ数17
    75
    エディション15
    ISBN(電子版)9781607685395
    DOI
    出版物ステータスPublished - 2016
    イベントSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting - Honolulu, United States
    継続期間: 2016 10 22016 10 7

    Other

    OtherSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting
    United States
    Honolulu
    期間16/10/216/10/7

      フィンガープリント

    ASJC Scopus subject areas

    • Engineering(all)

    これを引用

    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. : Molten Salts and Ionic Liquids 20 (15 版, 巻 75, pp. 17-33). Electrochemical Society Inc.. https://doi.org/10.1149/07515.0017ecst