Abstract
Anhydrous ruthenium dioxide electrodes were prepared by heating hydrous ruthenium dioxide at different temperatures and their anodic polarization characteristics in acidic solutions were investigated, in connection with their physical properties. The anodic polarization characteristics are greatly affected by the preparing temperature and are closely related to their physical properties, such as the crystallinity, the crystalline size and the resistivity. Generally, the electrode composed of poorly crystalline ruthenium dioxide shows the good anodic polarization characteristics. In conclusion, it was revealed that excellent anode material is obtainable by heating hydrous ruthenium dioxide in air at about 450°C. This electrode is quite stable under the anodic polarization in acidic solutions and has strong resistance against the anodic dissolution together with very low overvoltage for the oxygen evolution.
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