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

doi:10.1149/07515.0017ecst

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

School of Advanced Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 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 language	English
Title of host publication	Molten Salts and Ionic Liquids 20
Editors	L. M. Haverhals, R. A. Mantz, P. C. Trulove, M. Ueda, M. Carter, E. J. Biddinger, A. H. Suroviec, M. Reichert, F. Endres, A. Bund, A. Ispas, D. M. Fox, H. C. De Long
Publisher	Electrochemical Society Inc.
Pages	17-33
Number of pages	17
Edition	15
ISBN (Electronic)	9781607687320, 9781607687672, 9781607687689, 9781607687696, 9781607687702, 9781607687719, 9781607687726, 9781607687733, 9781607687740, 9781607687757, 9781607687771, 9781607687788, 9781607687795, 9781607687801, 9781607687818, 9781607687825, 9781607687832, 9781607687849, 9781607687856, 9781607687863, 9781607687887, 9781607687894, 9781607687900, 9781607687917, 9781607687924, 9781607687931, 9781607687948, 9781607687955, 9781607687962, 9781607687979, 9781607687986, 9781607687993, 9781607688006, 9781607688013, 9781607688020, 9781607688037
DOIs	https://doi.org/10.1149/07515.0017ecst
Publication status	Published - 2016
Event	Symposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting - Honolulu, United States Duration: 2016 Oct 2 → 2016 Oct 7

Publication series

Name	ECS Transactions
Number	15
Volume	75
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Other

Other	Symposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting
Country/Territory	United States
City	Honolulu
Period	16/10/2 → 16/10/7

ASJC Scopus subject areas

Engineering(all)

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10.1149/07515.0017ecst

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Nohira, T., Ido, A., Shimao, T., Yang, X., Yasuda, K., Hagiwara, R., & Homma, T. (2016). A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. In L. M. Haverhals, R. A. Mantz, P. C. Trulove, M. Ueda, M. Carter, E. J. Biddinger, A. H. Suroviec, M. Reichert, F. Endres, A. Bund, A. Ispas, D. M. Fox, & H. C. De Long (Eds.), Molten Salts and Ionic Liquids 20 (15 ed., pp. 17-33). (ECS Transactions; Vol. 75, No. 15). Electrochemical Society Inc.. https://doi.org/10.1149/07515.0017ecst

A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. / Nohira, Toshiyuki; Ido, Akifumi; Shimao, Takeyuki et al.
Molten Salts and Ionic Liquids 20. ed. / L. M. Haverhals; R. A. Mantz; P. C. Trulove; M. Ueda; M. Carter; E. J. Biddinger; A. H. Suroviec; M. Reichert; F. Endres; A. Bund; A. Ispas; D. M. Fox; H. C. De Long. 15. ed. Electrochemical Society Inc., 2016. p. 17-33 (ECS Transactions; Vol. 75, No. 15).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Nohira, T, Ido, A, Shimao, T, Yang, X, Yasuda, K, Hagiwara, R & Homma, T 2016, A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. in LM Haverhals, RA Mantz, PC Trulove, M Ueda, M Carter, EJ Biddinger, AH Suroviec, M Reichert, F Endres, A Bund, A Ispas, DM Fox & HC De Long (eds), Molten Salts and Ionic Liquids 20. 15 edn, ECS Transactions, no. 15, vol. 75, Electrochemical Society Inc., pp. 17-33, Symposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting, Honolulu, United States, 16/10/2. https://doi.org/10.1149/07515.0017ecst

Nohira T, Ido A, Shimao T, Yang X, Yasuda K, Hagiwara R et al. A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. In Haverhals LM, Mantz RA, Trulove PC, Ueda M, Carter M, Biddinger EJ, Suroviec AH, Reichert M, Endres F, Bund A, Ispas A, Fox DM, De Long HC, editors, Molten Salts and Ionic Liquids 20. 15 ed. Electrochemical Society Inc. 2016. p. 17-33. (ECS Transactions; 15). doi: 10.1149/07515.0017ecst

Nohira, Toshiyuki ; Ido, Akifumi ; Shimao, Takeyuki et al. / A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt. Molten Salts and Ionic Liquids 20. editor / L. M. Haverhals ; R. A. Mantz ; P. C. Trulove ; M. Ueda ; M. Carter ; E. J. Biddinger ; A. H. Suroviec ; M. Reichert ; F. Endres ; A. Bund ; A. Ispas ; D. M. Fox ; H. C. De Long. 15. ed. Electrochemical Society Inc., 2016. pp. 17-33 (ECS Transactions; 15).

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title = "A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt",

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.",

author = "Toshiyuki Nohira and Akifumi Ido and Takeyuki Shimao and Xiao Yang and Kouji Yasuda and Rika Hagiwara and Takayuki Homma",

note = "Funding Information: This study was partly supported by Core Research for Evolutionary Science and Technology (CREST) from Japan Science and Technology Agency (JST), Grants-in-Aid for Scientific Research A from the Japan Society for the Promotion of Science (JSPS), The Japan Prize Foundation, and Kato Foundation for Promotion of Science. The purified SiO2 granules were supplied by Taiheiyo Cement Corporation; Symposium on Molten Salts and Ionic Liquids 20 - PRiME 2016/230th ECS Meeting ; Conference date: 02-10-2016 Through 07-10-2016",

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AU - Hagiwara, Rika

AU - Homma, Takayuki

N1 - Funding Information: This study was partly supported by Core Research for Evolutionary Science and Technology (CREST) from Japan Science and Technology Agency (JST), Grants-in-Aid for Scientific Research A from the Japan Society for the Promotion of Science (JSPS), The Japan Prize Foundation, and Kato Foundation for Promotion of Science. The purified SiO2 granules were supplied by Taiheiyo Cement Corporation

PY - 2016

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N2 - 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.

AB - 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.

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ER -

A new electrolytic production process of silicon using liquid Zn alloy cathode in molten salt

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