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AbstractA comparative study of the electrochemical behaviour of Ru and RuO2 electrodes in solutions of 0·5M H2SO4, 1M HCl and 0·1M KOH has been performed with a view to elucidate in more detail the nature of the processes taking place on the surface of these electrodes within the range of potentials from 0·2 to 1·45 V (reversible hydrogen electrode, RHE). Cyclic voltammetry, chronopotentiometry and spectrophotometric analysis techniques have been employed. In accordance with thermodynamic data, it has been shown that amorphous layers of slightly soluble Ru(OH)3 and RuO2.nH2O form on the surface of an active Ru electrode at 0·21·35 V, transpassive anodic dissolution of ruthenium electrode takes place in both acid and alkaline electrolytes concomitantly with oxygen evolution. The RuO2 electrode demonstrates capacitor type voltammetric response at 0·4<E<1·4 V in both acid and alkaline medium. It has been proposed that such behaviour can be accounted for by a non-faradaic double layer process involving reversible adsorption/desorption of OH− ions on the surface of RuO2 electrode as described by the following equationRuO2+H2O ↔Qad RuO2.(OH−)ad+H+where Q ad is the charge related to this process.Keywords: RUTHENIUMRUO2ANODIC OXIDATIONPASSIVATIONMETAL OXIDE ELECTRODE
Juodkazytė et al. (Sun,) studied this question.