Electrode kinetics of oxygen reduction on oxide-free platinum electrodes

摘要: Abstract The cathodic V log i curves for O2 reduction on oxide-free Pt electrodes were determined in oxygen-saturated purified acid (HClO4, pH 1–3) and alkaline (NaOH, 13) solutions. It was found that ∂V/∂ = −2·3RT/F, pO2 −2·3RT/F −100 mV. Coverage of by oxygen-containing species superimposing a constant current over the working electrode. Intermediate values coverages to be nearly linearly dependent potential Tafel region. kinetics mechanism electrode are different from reported oxide-covered Reaction discussed terms Langmuir Temkin adsorption isotherms. is suggested under conditions rate-determining step over-all four-electron process first electron transfer.