Stationary anode process at the platinum in KF- NaF-AlF3-Al2O3 melts

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

KEY WORDS:

oxide-fluoride melt, platinum, polarization, experiment, theoretical model, charge transfer, adsorption, desorption.

ABSTRACT:

The kinetics of anode process occurred on platinum in the KF-NaF-AlF3-Al2O3 melts were studied by potentoistatic polarization in the steady-state conditions at 725-800°C. Considering platinum as an indifferent oxygen-evolved electrode, the two-stage scheme of anode process was proposed. According to this scheme the primary charge transfer  with the formation of the Oads adsorbed particles is followed by a desorption in conjunction with physical or electrochemical mechanism. The model calculations of polarization dependencies for anode process on platinum in the steady-stage mode, taking into account the domination of the different stage processes and the desorption mechanism were carried out. The comparison analysis for the model and experimental stationary anode polarization dependencies was evaluated.

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