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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationMolten Salts and Ionic Liquids 20
EditorsM. 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
PublisherElectrochemical Society Inc.
Pages17-33
Number of pages17
Edition15
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2016
EventSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting - Honolulu, United States
Duration: 2016 Oct 22016 Oct 7

Publication series

NameECS Transactions
Number15
Volume75
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherSymposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting
Country/TerritoryUnited States
CityHonolulu
Period16/10/216/10/7

ASJC Scopus subject areas

  • Engineering(all)

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