ELECTROCHEMICAL-BEHAVIOR OF THE SNO2-TIO2 NANOSTRUCTURES ON GLASSY-CARBON SUBSTRATES

Coulometric analysis of the cyclic voltammetry data demonstrates that nanostructures based on SnO2-TiO2 are capable of reversibly altering t heir stoichiometry in the course of polarization in acidic solutions. Intercalation of oxygen-containing particles and the reverse processes occur at sufficiently high rates over the entire volume of materials only after a lengthy cyclic activation. Comparing polarization capacit ances for samples prepared under different conditions with the structu ral data reveals that the intercalation rate is higher for hydrated fo rms of oxides and that the surface layers of nanoparticles undergo hyd ration.