CHARACTERIZATION AND STABILITY OF DOPED SNO2 ANODES

Doped tin dioxide electrodes have been prepared by a standard spray py rolysis technique. The electrochemical behaviour of these electrodes h as been investigated by cyclic voltammetry in sulphuric acid using the Fe2+/Fe3+ redox couple system as test reaction. Oxygen evolution has been used to study the stability of doped SnO2 electrodes. The SnO2 el ectrodes doped with antimony and platinum exhibit the highest stabilit y. XPS analysis shows that the oxidation state of Sn, Sb and Pt are +4 , +3 and +2, respectively, the probable species being SnO2, Sb2O3 and PtO.