CHARGE TRANSFER KINETICS OF THE REDOX COUPLE Ti(IV)/Ti(III) IN CHLORIDE-FLUORIDE MELTS
The charge transfer kinetics of the Ti(IV)/Ti(III) redox couple in the CsCl–CsF(10 wt %)–K<sub>2</sub>TiF<sub>6</sub> melt was studied by cyclic voltammetry method. The area of quasi-reversibility of the charge transfer process in this redox couple was established. Diffusion coefficients of Ti(IV) in the CsCl–CsF(10 wt %)–K<sub>2</sub>TiF<sub>6</sub> melt were calculated. The standard rate constants of charge transfer (<i>k<sub>s</sub></i>) were calculated by the Nicholson’s method. It was shown that the standard rate constants do not depend on the polarization rate and increase with increasing temperature. The activation energies of the charge transfer process for the fluoride complexes of the Ti(IV)/Ti(III) redox couple in the CsCl–CsF system were determined. It was shown that the standard rate constants decrease and the activation energies increase from (NaCl–KCl)<sub>equimol</sub>–NaF(10 wt %)–K<sub>2</sub>TiF<sub>6</sub> and KCl–KF(10 wt %)–K<sub>2</sub>TiF<sub>6</sub> melts to the CsCl–CsF(10 wt %)–K<sub>2</sub>TiF<sub>6</sub> melt.