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A galvanostatic study of the electrolytic reduction silica in molten cryolite

โœ Scribed by E.J. Frazer; B.J. Welch

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
374 KB
Volume
22
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

Abstrati-The electrodeposition of silicon from SiO, dissolved in molten cryolite has been investigated using chronopotentiometry at nickel working electrodes. The reduction mechanism involves the slow predissociation of a silica complex to form an electroactive species: where the equilibrium constant K = k,/kb = 1.36, k, = 31.0 s-l and k* = 23.0~~'. The preceding slow chemical reaction and subsequent silicon-nickel interaction caused curvature in the E us In (Al"tl/')/tl'* plots and deviation from the expected value of n = 4. The diffusion coefficient for the electroactive species was found to be 6.4 x 10m5 cm-*/s at 1293 K.

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