The Cause of the Activity Loss of Titanium-Supported Ruthenium Dioxide Electrodes during the Anodic Evolution of Oxygen

The cause of the activlty loss of TiRuO2and Ti(RuO2TiO2)electrodes duri the anodic evolufion of oxygen was investigatedOn the basis of the information obtainedit was presumed that the most serious causes are probably penetration of electrolyte throh cacks or pores in active layernd dissolution of active layer or RuO2both of which lead to the formation of a resistive TiO2 ilm on the Ti base 1 1troduction During the past ten years the electrochemical properties of Ti anodes coated with a layer of RuOand TiOso-called Dimensionally Stable Anodes(DSA)have extensively been studied howeverthe published papers contain very little descriptions on the cause of the activi 10ss of the DSA in the electrolysis of brine and waterThe activity loss generally mani fests as a rapid increase in potentials after a certain timeor an end of the service life