ANODIC OXYGEN EVOLUTION REACTION AT HIGH-TEMPERATURES IN ACID-SOLUTIONS AT PLATINUM

The polarization curves of oxygen evolution and reduction at platinum electrode were obtained in diluted aqueous solutions of sulfuric and p erchloric acids in the temperature range 20-325 degrees C. The Tafel s lopes of polarization curves of oxygen evolution are practically indep endent of the temperature in the whole investigated temperature range. The strong dependence of the transfer coefficient upon the temperatur e is discussed in terms of the influence of adsorption of intermediate s on the reaction kinetics. At highest temperatures, a rest potential was observed which may correspond to the reversible oxygen potential.