The Anodic Reaction of Sulfide Ions at Graphite Electrodes in Molten Cryolite

The anodic reaction of sulfide ions at graphite electrodes in molten cryolite has been studied by cyclic voltammetry at 1323 deg K. The anodic reaction is found to proceed via a quasireversible mechanism, one in which the current is controlled by both diffusion and charge transfer kinetics, and the...

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Published in:Journal of the Electrochemical Society 1984-10, Vol.131 (10), p.2279-2282
Main Authors: Minh, Nguyen Quang, Yao, Neng‐Ping
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Yao, Neng‐Ping
description The anodic reaction of sulfide ions at graphite electrodes in molten cryolite has been studied by cyclic voltammetry at 1323 deg K. The anodic reaction is found to proceed via a quasireversible mechanism, one in which the current is controlled by both diffusion and charge transfer kinetics, and the equation is given. The transfer coefficient beta and the standard rate constant ks are estimated to be 0.5 and 4.2 x 10 exp --3 cm/sec, respectively. The apparent diffusion coefficient for sulfide ions in cryolite at 1323 deg K is approx 3.93 x 10 exp --5 cm exp 2 /sec. The studies were carried out as part of the experimental work on the molten salt electrolysis of Al2S3 for the production of Al. 32 ref.--AA(UK/US)*.
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title The Anodic Reaction of Sulfide Ions at Graphite Electrodes in Molten Cryolite
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