ИЗУЧЕНИЕ КИНЕТИЧЕСКИХ ЗАКОНОМЕРНОСТЕЙ ПРОЦЕССОВ ВОССТАНОВЛЕНИЯ ИОНОВ Fe(III) до Fe(II) B КОНЦЕНТРИРОВАННЫХ ЭЛЕКТРОЛИТАХ

Ольга КОВАЛЕВА Молдaвский государственный университет

Аннотация

The kinetic parameters have been determined of the reaction Fe(III)⎯⎯+e→Fe(II) within the potentials range from +0,64 to (-0,4) V, proceeding from the complex polarization research of iron-containing electrolytic solutions. The effect of the secondary electrochemical process (reduction of oxygen dissolved in the electrolyte) is discussed. It was found that the diffusion coefficient of Fe(III) under the studied conditions is equal to 535±0,02 · 10-5 сm2/s, values of process activation energy Аef. on Pt electrode fall within the range 12,57 to 25,14 kJ/mol, in dependence on the electrode potential, exchange current density value for studied target reaction was Jo = 0,019 А/cm2. The determined values of the kinetic parameters will make it possible to apply the mathematical model to describe this process within the body of three-dimensional porous electrodes. Кeywords: polarization, activation energy, limiting diffusion current, kinetic parameters.