pH Effect on oxygen reduction reaction at polycrystalline Au electrode

TL;DRAbstract

Oxygen reduction reaction (ORR) at polycrystalline Au electrode was investigated using rotating disk electrode (RDE). It's found that the onset potential and the kinetic current for ORR at Au Electrode do not change with pH in both acidic and alkaline conditions. The overpotential for ORR decreases with increase in solution pH at a rate of ca. 79 mV/pH. In acidic condition and in high overpotential range in alkaline condition, the Tafel slopes are near 120 mV/dec; while in low overpotential range in alkaline condition, the Tafel slopes are near 60mV/dec. The mechanisms and factors affect the intrinsic ORR kinetics at Au electrode are discussed.

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