Abstract
The Ti-supported Mn oxide electrode was modified by introducing a Ru oxide film as an intermediate layer into the Ti/Mn oxide interface, and its anodic characteristics were examined in aqueous solutions of 0.5 M H 2SO 4, 1 M KOH and 5 M NaCl. The intermediate thin film of the Ru oxide served effectively as a good conductor to improve the electric characteristics of the Ti-supported Mn oxide electrode and hence the modified electrode exhibited the excellent anodic characteristics similar to those of the Pt-based Mn oxide. From the kinetic considerations, it was proved that the anodic evolution of oxygen takes place on the surface of Mn oxide. The Mn oxide was found to be virtually active electrocatalyst for electrolytic chlorine evolution as well as electrolytic oxygen evolution. As a result of the evaluation of the catalytic activity, it was considered that the Mn oxide is one of the most active material of all, except for some DSA-type electrodes such as Ru and Ir oxides, for the anodic evolution of oxygen. In conclusion, the presented results suggest that the modified Mn oxide electrode has a promising character for the practical use in water electrolysis.
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