Electrolytic Reduction of SiO₂ Granules in Molten CaCl₂

• TOBA Tetsuya

  Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University

• YASUDA Kouji

  Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University Environment, Safety and Health Organization, Kyoto University

• NOHIRA Toshiyuki

  Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University

• YANG Xiao

  Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University

• HAGIWARA Rika

  Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University

• ICHITSUBO Koki

  R&D Center, Taiheiyo Cement Corporation

• MASUDA Kenta

  R&D Center, Taiheiyo Cement Corporation

• HOMMA Takayuki

  Faculty of Science and Engineering, Waseda University

Bibliographic Information

Other Title

• Electrolytic Reduction of SiO₂ Granules in Molten CaCl₂

Abstract

Direct electrolytic reduction of SiO₂ was investigated in molten CaCl₂ at 1123 K as a fundamental study to develop a continuous process for solar-grade Si production. Several different types of SiO₂ 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.

Journal

• Electrochemistry

  Electrochemistry 81 (7), 559-565, 2013

  The Electrochemical Society of Japan

Keywords

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

Details

• CRID: 1390282681475918592
• NII Article ID: 10031178969
• NII Book ID: AN00151637
• DOI: 10.5796/electrochemistry.81.559
• ISSN: 21862451
• ISSN: 13443542
• NDL BIB ID: 024669287
• Web Site: http://id.ndl.go.jp/bib/024669287
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024669287
• Web Site: https://www.jstage.jst.go.jp/article/electrochemistry/81/7/81_13-1-E2612/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Allowed