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Chronopotentiometry at platinum electrode in KF-NaF-AlF3-Al2O3 melt

A. V. Suzdaltsev, A. P. Khramov, Yu. P. Zaikov, O. V. Limanovskaya, V. N. Nekrasov

Abstract


Some features of the mechanism of the anode process on platinum in KF–NaF–AlF3–Al2O3 melt at 750-780 °C depending on the of anodic current density (0.5 mA/cm2 to 2.0 A/cm2) and anodic pulse duration have been studied using chronopotentiometry method. In curves of change in the platinum anode potential a small peak at current densities of 10-30 mA/cm2 and a clear peak at current densities of 0.5-2.0 A/cm2 are recorded when the current is cut on. Analysis of dependencies of the transition time on the current density indicates that the first peak in curve is associated with the formation of an oxide compound on the platinum surface, and the second one is related to hindering the diffusion for delivery of electroactive particles to its surface.

Keywords


oxide-fluoride melts; chronopotentiometry; platinum; oxidation

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References


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DOI: http://dx.doi.org/10.15826/chimtech.2015.2.3.020

Copyright (c) 2015 A. V. Suzdaltsev, A. P. Khramov, Yu. P. Zaikov, O. V. Limanovskaya, V. N. Nekrasov

© Chimica Techno Acta, 2014-2019
ISSN 2411-1414 (Online), ISSN 2409-5613 (Print)

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