Resonance Tunneling During the Anodic Oxygen Evolution at Oxide Covered Platinum Electrodes

The model of resonance tunneling is applied to experimental data on the anodic oxygen evolution on oxide covered platinum electrodes. Changes of the transfer coefficient, activation energy and frequency factor are experimentally observed at a critical overvoltage ncThis can be quantitatively explained, if a change from direct tunneling to resonance tunneling via valence states of the oxide is taken into account. At the flat band potential, these states are about 1.2 eV below the Fermi level.