In the search for a DSA-type electrode for oxygen evolution in acidic solns., nine binary coatings with IrO2, RuO2, Pt as conducting component, and TiO2, ZrO2, Ta2O5 as inert oxides, were deposited on titanium, examd. for their microstructural properties and tested for their electrocatalytic activity and anodic stability. Electrochem. "true" surfaces of the coatings were found to be dependent on structure and morphol.: the mixts. that form a solid soln. (RuO2-TiO2), or allow limited miscibility (IrO2-TiO2), show the lowest dispersion of active material. Differences in service lives, are attributed to differences in wear mechanisms of the electrodes. Ti/IrO2 (70 mol%)-Ta2O5 (30 mol%) is by far the best electrode. [on SciFinder (R)]