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

5 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルMolten Salts and Ionic Liquids 20
編集者M. Carter, F. Endres, E. J. Biddinger, M. Reichert, A. Ispas, H. C. De Long, A. Bund, L. M. Haverhals, R. A. Mantz, P. C. Trulove, D. M. Fox, A. H. Suroviec, M. Ueda
出版社Electrochemical Society Inc.
ページ17-33
ページ数17
15
ISBN(電子版)9781607685395
DOI
出版ステータス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

出版物シリーズ

名前ECS Transactions
番号15
75
ISSN(印刷版)1938-5862
ISSN(電子版)1938-6737

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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