Kinetic characteristics of electrochemical reduction of SiO2 granules in molten CaCl2

Xiao Yang, Kouji Yasuda, Toshiyuki Nohira, Rika Hagiwara, Takayuki Homma

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    The kinetic characteristics of electrochemical reduction of SiO2 granules in molten CaCl2 were investigated to develop a new process for producing solar-grade silicon. The reduction rate was evaluated based on the time dependence of the reduction fractions measured from the growth of the reduced Si layer and the weight change of the samples during electrolysis. The samples were prepared by potentiostatic electrolysis of SiO2 granules in molten CaCl2 at 1123 K. The results indicated that the reduction was fast at the initial stage of electrolysis, and gradually slowed as the reaction progressed. The apparent current density reached 0.7 A cm-2 at the initial stage, which was comparable to the commercial Hall-Héroult process for aluminum production.

    Original languageEnglish
    JournalJournal of the Electrochemical Society
    Volume161
    Issue number7
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    electrolysis
    Molten materials
    Electrolysis
    Kinetics
    kinetics
    time dependence
    grade
    Silicon
    Aluminum
    current density
    aluminum
    Current density
    silicon

    ASJC Scopus subject areas

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

    Cite this

    Kinetic characteristics of electrochemical reduction of SiO2 granules in molten CaCl2 . / Yang, Xiao; Yasuda, Kouji; Nohira, Toshiyuki; Hagiwara, Rika; Homma, Takayuki.

    In: Journal of the Electrochemical Society, Vol. 161, No. 7, 2014.

    Research output: Contribution to journalArticle

    Yang, Xiao ; Yasuda, Kouji ; Nohira, Toshiyuki ; Hagiwara, Rika ; Homma, Takayuki. / Kinetic characteristics of electrochemical reduction of SiO2 granules in molten CaCl2 In: Journal of the Electrochemical Society. 2014 ; Vol. 161, No. 7.
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