A critical parameter in the evaluation of the activity of different catalysts toward one reaction is the estimate of the active sites concentration at the electrode surface. A preparation scheme of models of the dimensionally stable anodes (DSA) is presented which comprises ion-implantation of Ru (Ir) into titanium followed by electrochemical oxidation of the near-surface alloys. Results pertinent to DSA like anodes include the determination of the mechanisms of the Cl-2 evolution reaction and the specific catalytic activities of Ru and Ir.