Standard Rate Constants of Charge Transfer for the Nb(V)/Nb(IV) Redox Couple in CsCl-K2NbF7 Melt

Abstract

The electrochemical behavior of the Nb(V)/Nb(IV) redox couple in in the CsCl-K2NbF7 melt was studied at 973-1123 K by cyclic voltammetry. The standard rate constants of charge transfer (ks) on platinum and glassy carbon electrodes for Nb(V)/Nb(IV) redox couple were calculated on the basis of cyclic voltammetry data. It was found that ks increased with increasing temperature and values of ks obtained at platinum electrode were higher than at a glassy carbon electrode. The values of constants testify that the redox process proceeds quasi-reversibly, mostly under diffusion control.