NDLI: Molten Salt Electrodeposition of Silicon in Cu-Si

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Molten Salt Electrodeposition of Silicon in Cu-Si

Content Provider	Semantic Scholar
Author	Sokhanvaran, Samira
Copyright Year	2014
Abstract	Widespread use of solar energy has not been realized to date because its cost is not competitive with conventional energy sources. The high price of solar grade silicon has been one of the barriers against photovoltaic industry achieving its much anticipated growth. Therefore, developing a method, which is energy efficient and will deliver inexpensive silicon feedstock material is essential. The electrodeposition of Si from a cryolite-based melt was investigated in the present work as a possible solution. This study proposed electrowinning of Si in molten Cu-Si alloy, to decrease the working temperature and increase the efficiency. Solvent refining can be used to recover Si from Cu-Si and also as a second purification method. The physicochemical properties of the potential electrolyte, cryolite–SiO2 melts, were studied in the first step of this work. The deposition potential of Si on a graphite cathode was measured to determine the working potential and the effect of SiO2 concentration on it. In the next step, the deposition potential of Si from cryolite– SiO2 melt on Cu and Cu-Si cathodes was determined using cyclic voltammetry. Next, the cathodic and the anodic current efficiencies of the process were measured. Continuous analysis of the evolved gas enabled the instantaneous measurement of the current efficiency and the kinetics of the deposition. Finally, the effectiveness of the process in delivering high purity Si
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://tspace.library.utoronto.ca/bitstream/1807/68320/1/Sokhanvaran_Samira_201411_PhD_thesis.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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