Electrolytic reduction of SiO2 granules in molten CaCl 2

Tetsuya Toba, Kouji Yasuda, Toshiyuki Nohira, Xiao Yang, Rika Hagiwara, Koki Ichitsubo, Kenta Masuda, Takayuki Homma

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Direct electrolytic reduction of SiO2 was investigated in molten CaCl2 at 1123K as a fundamental study to develop a continuous process for solar-grade Si production. Several different types of SiO 2 granules, as well as SiO2 pellets, were successfully reduced to Si on the bottom cathode of a Si plate. Three parameters were varied in the reduction of SiO2 granules: electrode potential, layer thickness of the SiO2 granules, and SiO2 particle size. The reduction rate was evaluated by the magnitude of the reduction current. The main factor determining the reduction rate was the diffusion of O2- ions inside the reduced porous Si layer filled with the electrolyte. Another factor which influenced the reduction rate was the contact resistance between Si granules.

    Original languageEnglish
    Pages (from-to)559-565
    Number of pages7
    JournalElectrochemistry
    Volume81
    Issue number7
    DOIs
    Publication statusPublished - 2013 Jul

    Fingerprint

    Electrolytic reduction
    Molten materials
    Contact resistance
    Electrolytes
    Cathodes
    Particle size
    Ions
    Electrodes

    Keywords

    • Electrolysis
    • Molten Salt
    • Silica
    • Solar-grade Silicon

    ASJC Scopus subject areas

    • Electrochemistry

    Cite this

    Toba, T., Yasuda, K., Nohira, T., Yang, X., Hagiwara, R., Ichitsubo, K., ... Homma, T. (2013). Electrolytic reduction of SiO2 granules in molten CaCl 2 Electrochemistry, 81(7), 559-565. https://doi.org/10.5796/electrochemistry.81.559

    Electrolytic reduction of SiO2 granules in molten CaCl 2 . / Toba, Tetsuya; Yasuda, Kouji; Nohira, Toshiyuki; Yang, Xiao; Hagiwara, Rika; Ichitsubo, Koki; Masuda, Kenta; Homma, Takayuki.

    In: Electrochemistry, Vol. 81, No. 7, 07.2013, p. 559-565.

    Research output: Contribution to journalArticle

    Toba, T, Yasuda, K, Nohira, T, Yang, X, Hagiwara, R, Ichitsubo, K, Masuda, K & Homma, T 2013, 'Electrolytic reduction of SiO2 granules in molten CaCl 2 ', Electrochemistry, vol. 81, no. 7, pp. 559-565. https://doi.org/10.5796/electrochemistry.81.559
    Toba T, Yasuda K, Nohira T, Yang X, Hagiwara R, Ichitsubo K et al. Electrolytic reduction of SiO2 granules in molten CaCl 2 Electrochemistry. 2013 Jul;81(7):559-565. https://doi.org/10.5796/electrochemistry.81.559
    Toba, Tetsuya ; Yasuda, Kouji ; Nohira, Toshiyuki ; Yang, Xiao ; Hagiwara, Rika ; Ichitsubo, Koki ; Masuda, Kenta ; Homma, Takayuki. / Electrolytic reduction of SiO2 granules in molten CaCl 2 In: Electrochemistry. 2013 ; Vol. 81, No. 7. pp. 559-565.
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