Kinetic behaviour of the Sn(IV)-Sn(II) couple in acidified concentrated bromide solutions at a glassy carbon rotating ring-disk electrode

Abstract Kinetic parameters of the Sn(IV)-Sn(II) couple are evaluated at a glassy carbon rotating ring-disk electrode in acidified concentrated bromide media. Both the oxidation and reduction are found to be first order in reactant and to proceed irreversibly. While the oxidation of Sn(II) shows no complications, the reduction of Sn(IV) is probably preceded by a homogeneous chemical reaction involving complexation with bromide ions. Only in highly concentrated bromide media (10 M) is a relatively undisturbed Sn(IV) reduction wave obtained.