The electrodeposition of silicon in fluoride melts

Boën, R.; Bouteillon, J.

doi:10.1007/bf00941599

Cited by 87 publications

(65 citation statements)

References 22 publications

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“…There is some controversy over the mechanism by which fluorosilicate is reduced. It is contested whether this occurs by the double-step reduction of Si(IV) via Si(II) [9] or the single-step reduction of Si(IV) [10]. Here, we were able to clearly measure two cathodic peaks with cyclic voltammetry, as shown in Fig.…”

Section: Comparison Of Cyclic Voltammetry Between Inert and Consumablmentioning

confidence: 82%

Morphology Change Of Si Deposit In Molten Salt Electrorefining

Ryu¹,

Kwon²,

Han³

et al. 2015

Archives of Metallurgy and Materials

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The effects of processing parameters on the morphology change in a Si deposit recovered by means of molten salt electrorefining are evaluated using electrochemical techniques such as cyclic voltammetry and chronopotentiometry at 800 • C. It was found that concentration of K 2 SiF 6 and current density were important parameters in determining deposit size. Higher concentrations of K 2 SiF 6 were effective in coarsening the silicon deposit and decreasing the cell potential. Silicon nanofiber was recovered at 5 wt% of K 2 SiF 6 whereas dense particles were prepared at 30 and 50 wt% of K 2 SiF 6 . The morphology of the Si deposit was determined by the concentration of Si in the electrolyte which is related to the formation of crystal and growth of Si. The formation mechanism of the Si deposit was interpreted by using high resolution TEM as well as electrochemical properties.

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Section: Comparison Of Cyclic Voltammetry Between Inert and Consumablmentioning

confidence: 82%

Morphology Change Of Si Deposit In Molten Salt Electrorefining

Ryu¹,

Kwon²,

Han³

et al. 2015

Archives of Metallurgy and Materials

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“…The potential was swept with different rates (20,50,80, and 100 mV s À1 ) in the cathodic direction from 0.3 V. The recorded voltammograms are presented in Figure 5. The bulk deposition potentials independent of the scan rate indicate that the reaction is reversible.…”

Section: E Effect Of Scan Ratementioning

confidence: 99%

“…The reactions decrease the theoretical decomposition potential to À0.73 and À0.57 V for CO 2 and CO release, respectively. [11] The experimentally measured deposition potentials [12][13][14][15][16][17][18][19][20] are considerably different from these calculated values. For example, the decomposition potential on graphite cathode has been reported between À0.80 and À1 V, [12][13][14][15][16][17][18][19][20] which is approximately 0.25 V larger than the predicted potential.…”

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confidence: 99%

“…According to Boe et al, [13] this difference is mainly due to the polarization and concentration overpotential. However, applying cyclic voltammetry by Boen et al, [20] Osen et al, [19] and Ming et al [21] revealed two-step reduction of Si 4+ in the alkaline fluoride melts. This method also enabled measuring the deposition potential of Si on a graphite cathode that is reported to be approximately À0.8 V vs Ag electrode.…”

mentioning

confidence: 99%

“…This method also enabled measuring the deposition potential of Si on a graphite cathode that is reported to be approximately À0.8 V vs Ag electrode. [20] Cryolite-based salts have been reported as the most suitable electrolyte for electrolysis of the silicon with respect to the product purity and current efficiency. [22][23][24][25] The main focus of this study is to determine the decomposition potential of Si, from cryolite-SiO 2 on a Cu cathode, using cyclic voltammetry.…”

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confidence: 99%

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Determination of Cell Potential for Silicon Electrodeposition

Sokhanvaran

Danaei

Barati

2014

Metallurgical and Materials Transactions E

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Electrowinning of Si from cryolite-based melts is a possible solution for mass production of high purity silicon. The required cell potential to deposit Si on a cathode of interest, copper, is fundamental information that needs to be measured for controlling the co-deposition of impurities. In this study, the potential was measured using cyclic voltammetry in a cryolite-6 pct SiO 2 melt. The deposited Si on copper forms a Cu-Si alloy in which the activity of Si affects the decomposition potential. The measurements were carried out in a range of Si concentrations, allowing the prediction of potential change during the actual deposition process, where the Si content changes constantly. The results were compared with the values obtained from cyclic voltammetry on an inert electrode, graphite, to investigate if the formation of Cu-Si alloy is responsible for decreasing the potential.

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Electrodeposition of Semiconductors

Schlesinger

Rajeshwar

2010

Modern Electroplating

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The electrodeposition of silicon in fluoride melts

Cited by 87 publications

References 22 publications

Morphology Change Of Si Deposit In Molten Salt Electrorefining

Morphology Change Of Si Deposit In Molten Salt Electrorefining

Determination of Cell Potential for Silicon Electrodeposition

Electrodeposition of Semiconductors

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