Voltammetric study of electroreduction of silicon complexes in a chloride-fluoride melt

Кузнецова, С. В.; Dolmatov, V. S.; Kuznetsov, S. A.

doi:10.1134/s1023193509070052

Cited by 45 publications

(30 citation statements)

References 13 publications

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“…It has been known for many years that silicon films can be fabricated by electrodeposition. [9][10][11][12][13][14][15][16] All researchers have conducted the deposition of silicon by electroplating in a mixed solvent that consists of alkali fluorides and silicon fluoride. However, the electrolysis of a simple molten system containing an oxide and an alkali metal halides mixture and the theoretical research on electrochemical process are not been studied, which can give a better understanding the influence of process parameters on chemical composition and the morphology of the final product.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Silicon in the (NaCl-KCl-NaF-SiO2) Molten Salt

Cai¹,

Li²,

He³

et al. 2010

Metall Mater Trans B

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The electrochemical behavior of silicon was investigated in a molten salts system including saturation silicon dioxide. Silicon was electrodeposited and MoSi 2 was formed on the employed molybdenum working electrode by the diffusivities of silicon and the substrate metals. Transient electrochemical techniques such as cyclic voltammetry and chronoamperometry were used to study the reaction mechanism at the molybdenum electrode. Cyclic voltammograms showed the possibility of electrodeposition of Si at À0.64 V versus Pt reference electrode in a NaCl-KClNaF-SiO 2 system at 1073 K (800°C). The electrodeposition of Si is single-step charge-transfer process and the cathode process is irreversible. Chronoamperometry studies indicated that electrocrystallization of Si is controlled by progressive nucleation with a three-dimensional growth mechanism.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Silicon in the (NaCl-KCl-NaF-SiO2) Molten Salt

Cai¹,

Li²,

He³

et al. 2010

Metall Mater Trans B

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“…Studies on Si(IV) electroreduction have been reported by several authors [9][10][11][12][13]. The deposition mechanism of silicon from NaCl-KCl-K 2 SiF 6 , proposed by Delimarskii [9], involves a single reduction wave on a molybdenum electrode.…”

Section: Introductionmentioning

confidence: 99%

Fluoroacidity evaluation in molten salts

Bieber

Massot

Gibilaro

et al. 2011

Electrochimica Acta

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International audienceThe fluoroacidity of several alkaline fluoride media was studied by monitoring the concentration of electroactive species which is decreasing versus time due to a gas species release, such as silicon fluorides, as indicated by the reaction: SiF(4+x)x- = SiF4(g) + x F- This article relates the Si(IV) reaction study to define a relative fluoroacidity scale by studying the silicon ions stability in different melts. Electrochemical techniques allow the measurement of SiF4+xx- concentration evolution and thus the reaction rate constant to be calculated at different temperatures and for several fluoride media. The article shows that the free F- content depends on the fluoride mixture and that the rate values are correlated with the fluoroacidity allowing a qualitative estimation. Then a fluoride solvents fluoroacidity scale was proposed, scaling the different eutectic melts from basic melt to acidic one: NaF-KF < LiF-KF < NaF-MgF2 < NaF-CaF2 < LiF-NaF < LiF < LiF-CaF2

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“…However, an increase in the K 2 SiF 6 concentration resulted in the fact that the first reduction wave was characterized by a barely noticeable inflection or that no visible wave resolution was observed in the case of the cathodic polarization. At the same time, silicon electrooxidation peaks Ox 1 and Ox 2 were always clearly pronounced in the anodic half-cycle of the voltammogram (15). Potentiostatic electrolysis at the first wave potential (E = -0.75 V vs. the glassy carbon electrode) did not result in visible electrode changes, but when the electrolyte remaining on the electrode was washed off after the electrode was removed from the melt, needle-and flake-form crystals were observed (Figure 4a).…”

Section: Resultsmentioning

confidence: 97%