R. M. Guseynov, R. A. Radjabov, U. M. Magomedova.
ABSTRACT
The aim of this study is to study the behavior of a silver electrode reversible over minority carriers in a sulfate solid electrolyte or in the corresponding ionic melt in the galvanodynamerfic mode. In this work, we apply the Laplace transform method of Ohm’s law on the interaction between current, potential and complex resistance (impedance), which is called operational impedance method in electrochemistry and electrical engineering. In addition to the operator impedance method, in this work we use an equivalent electric circuit of a silver electrode that is reversible with respect to oxygen and minority charge carriers (which are considered oxygen ions). The possibility of using equivalent electrical circuits in the study of relaxation processes in solid electrolytes was shown back in 1973 by the American electrochemist Armstrong [9, 10]. An analytical expression is obtained for the time dependence of the potential of the electrode–solid electrolyte interface or the corresponding ionic melt in the galvanodynamic mode of operation of the electrochemical cell. It was established by a graphoanalytical method that the galvanodynamic curve of the interphase potential versus time obeys an exponential function. In the present work, it was also shown that the difference between the silver electrode in sulfate electrolytes and the classical equivalent Ershler-Randles electric circuit is that, at very low concentrations of silver ions, the silver electrodeperforms another function, namely, the oxygen function.
KEYWORDS:
operational impedance, silver electrode, minority current carriers, galvanodynamic mode
DOI: 10.31857/S0235010620040040