The electrochemical cell with a reversible electrode–solid electrolyte or ionic melt interface in the galvanodynamical and potentiodunamical functioning modes

R.M. Guseynov, R. A. Radzhabov, H. M. Makhmudov, R. K. Kelbyhanov, E. A. Medzhidova, R.Y. Nadirova

ABSTRACT:

The main purpose of this article is a study of  kinetics of two simultaneous processes: the charging of the electric double layer and discharge-ionization on the reversible silver electrode – sulfate solid electrolyte interface and its melt in two modes: galvanodynamical and potentiodynamical. The investigation of the electrochemical kinetics was performed by operational impedance method which is based on the Laplas transformation and Ohm’s low between current, voltage and complex resistance (impedance). By corresponding mathematical computations we received the analytical expression of time dependence of current, which passes through electrochemical cell in potentiodynamical mode. The analytical expression of interface potential – time dependence in galvanodynamical regime (mode) is obtained as well. The electrode – solid electrolyte or its ionic melt interface potential – time dependence in galvanodynamical regime is submitted by exponential function. The time dependence of rhe current which passes through electrochemical cell in potentiodynamical regime is submitted by linear function. The comparative analysis of a results of two independent methods showed that for the investigation of the electrochemical systems contained the reversible metallic electrode – solid electrolyte and ionic melt interface may be used not only alternate current methods but relaxation methods also (for instance, Galvanodynamic and Potentiodynamic methods).

KEYWORDS:

Ershler–Randls scheme, ionic melt, solid electrolyte, reversible electrode,double electric layer