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Citation: JIA Ming, LAI Yan-Qing, TIAN Zhong-Liang, LIU Fang-Yang, LI Jie, XIN Peng-Fei, LIU Ye-Xiang. Electrodeposition Behavior of Silicon from Na₃AlF₆-LiF Melts[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1108-1115. doi: 10.3866/PKU.WHXB20110504 shu

Electrodeposition Behavior of Silicon from Na₃AlF₆-LiF Melts

1.
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 27 December 2010
Available Online: 25 March 2011
Fund Project: 高等学校博士学科点专项科研基金(200805331120) (200805331120) 湖南省研究生科研创新项目(CX2009B036) (CX2009B036) 中南大学研究生学位论文创新基金(2010bsxt02) (2010bsxt02)

A fundamental electrochemical study of Si in Na₃AlF₆-LiF melts and electrowinning and electrorefining in a small-scale laboratory cell was conducted. Cyclic voltammograms showed that the reduction of Si proceeds by two successive electron transfers and the presence of the Si(II) species in the melt was confirmed. Galvanostatic electrolysis showed that the deposited silicon crystal does not form any dense or massive layer at the graphite cathode as other metals do, but it is generally dispersed in the deposit around the cathode. The co-deposition of Al and Si is possible when the reduction potentials are more negative than -1.8 V versus Pt. The purity of the deposited Si was higher than 99.9%. This study demonstrates the feasibility of very pure Si production by electrochemical methods.
- Silicon,
- Deposition,
- Electrowinning,
- Electrorefining,
- Purity
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Electrodeposition Behavior of Silicon from Na₃AlF₆-LiF Melts