Standard Rate Constants of Charge Transfer for the Nb(V)/Nb(IV) Redox Couple in CsCl-K{sub}2NbF{sub}7 Melt

摘要

The electrochemical behavior of the Nb(V)/Nb(IV) redox couple in in the CsCl-K{sub}2NbF{sub}7 melt was studied at 973-1123K by cyclic voltammetry. The standard rate constants of charge transfer (k{sub}s) on platinum and glassy carbon electrodes for the Nb(V)/Nb(IV) redox couple were calculated on the basis of cyclic voltammetry data. It was found that k{sub}s increased with increasing temperature and values of k{sub}s 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.