Cyclic Voltammetry Behaviour of IrO₂-type Anodes Doped with Different Second Phases for Oxygen Evolution

The oxide coatings of IrO2-type anode doped with different second phases for oxygen evolution were prepared by traditional method of thermal decomposition. Cyclic voltammetry (CV) was used to study the influence of doping different second phase elements (Mn, Ni, Sn and Al) on the cyclic voltammetry behaviors of IrO2-type oxide anodes for oxygen evolution in 0.5 mol/L H2SO4 solution. The results showed that Ir-Mn oxide anode for oxygen evolution obtained the maximum of voltammetry charge qo on the outer surface of anode coating and Ir-Sn anode obtained the minimum. The Ir-Mn oxide anode for oxygen evolution also obtained the maximum of voltammetry charge qi on the inner surface of anode coating. The voltammetry charge qi of Ir-Al and Ir-Sn was relatively low compared to that of Ir-Mn. The gross voltammetry charge qT of Ir-Mn oxide anode was far greater than that of other coatings.