Si production by direct electrolytic reduction of solid SiO2 in molten CaCl2

Kouji Yasuda; Toshiyuki Nohira; Koji Amezawa; Yukio H. Ogata; Yasuhiko Ito

Si production by direct electrolytic reduction of solid SiO₂ in molten CaCl₂

Kouji Yasuda, Toshiyuki Nohira, Koji Amezawa, Yukio H. Ogata, Yasuhiko Ito

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

Abstract

Morphological and crystallographic investigations were conducted on the Si produced by direct electrolytic reduction of solid SiO₂ in molten CaCl₂ at 1123 K. From the results of SEM, it was proved that the produced Si had columnar shape. FE-SEM observation showed that the Si column had basically a hexagonal prismatic and stacking structure. The results of TEM and ED revealed that the Si column was a single crystal having {111} twin planes perpendicular to the major axis of the column. It is explained that amorphous Si is firstly formed by electrochemical reduction and then thermally transformed to crystalline Si. Purity of the Si was proved by EDX to be more than 99.9%. Current efficiency for the reduction of SiO₂ to Si was calculated as 74% at 0.70 V.

Original language	English
Title of host publication	Molten Salts XIV - Proceedings of the International Symposium
Pages	999-1005
Number of pages	7
Publication status	Published - 2006 Dec 1
Externally published	Yes
Event	206th ECS Meeting - Honolulu, HI, United States Duration: 2004 Oct 3 → 2004 Oct 8

Publication series

Name	Proceedings - Electrochemical Society
Volume	PV 2004-24

Other

Other	206th ECS Meeting
Country/Territory	United States
City	Honolulu, HI
Period	04/10/3 → 04/10/8

ASJC Scopus subject areas

Engineering(all)

Cite this

@inproceedings{b7347287f69b40b9a702318333f58c96,

title = "Si production by direct electrolytic reduction of solid SiO2 in molten CaCl2",

abstract = "Morphological and crystallographic investigations were conducted on the Si produced by direct electrolytic reduction of solid SiO2 in molten CaCl2 at 1123 K. From the results of SEM, it was proved that the produced Si had columnar shape. FE-SEM observation showed that the Si column had basically a hexagonal prismatic and stacking structure. The results of TEM and ED revealed that the Si column was a single crystal having {111} twin planes perpendicular to the major axis of the column. It is explained that amorphous Si is firstly formed by electrochemical reduction and then thermally transformed to crystalline Si. Purity of the Si was proved by EDX to be more than 99.9%. Current efficiency for the reduction of SiO2 to Si was calculated as 74% at 0.70 V.",

author = "Kouji Yasuda and Toshiyuki Nohira and Koji Amezawa and Ogata, {Yukio H.} and Yasuhiko Ito",

year = "2006",

month = dec,

day = "1",

language = "English",

isbn = "9781566775144",

series = "Proceedings - Electrochemical Society",

pages = "999--1005",

booktitle = "Molten Salts XIV - Proceedings of the International Symposium",

note = "206th ECS Meeting ; Conference date: 03-10-2004 Through 08-10-2004",

}

TY - GEN

T1 - Si production by direct electrolytic reduction of solid SiO2 in molten CaCl2

AU - Yasuda, Kouji

AU - Nohira, Toshiyuki

AU - Amezawa, Koji

AU - Ogata, Yukio H.

AU - Ito, Yasuhiko

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Morphological and crystallographic investigations were conducted on the Si produced by direct electrolytic reduction of solid SiO2 in molten CaCl2 at 1123 K. From the results of SEM, it was proved that the produced Si had columnar shape. FE-SEM observation showed that the Si column had basically a hexagonal prismatic and stacking structure. The results of TEM and ED revealed that the Si column was a single crystal having {111} twin planes perpendicular to the major axis of the column. It is explained that amorphous Si is firstly formed by electrochemical reduction and then thermally transformed to crystalline Si. Purity of the Si was proved by EDX to be more than 99.9%. Current efficiency for the reduction of SiO2 to Si was calculated as 74% at 0.70 V.

AB - Morphological and crystallographic investigations were conducted on the Si produced by direct electrolytic reduction of solid SiO2 in molten CaCl2 at 1123 K. From the results of SEM, it was proved that the produced Si had columnar shape. FE-SEM observation showed that the Si column had basically a hexagonal prismatic and stacking structure. The results of TEM and ED revealed that the Si column was a single crystal having {111} twin planes perpendicular to the major axis of the column. It is explained that amorphous Si is firstly formed by electrochemical reduction and then thermally transformed to crystalline Si. Purity of the Si was proved by EDX to be more than 99.9%. Current efficiency for the reduction of SiO2 to Si was calculated as 74% at 0.70 V.

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M3 - Conference contribution

AN - SCOPUS:40249088887

SN - 9781566775144

T3 - Proceedings - Electrochemical Society

SP - 999

EP - 1005

BT - Molten Salts XIV - Proceedings of the International Symposium

T2 - 206th ECS Meeting

Y2 - 3 October 2004 through 8 October 2004

ER -