Abstract
Scanning electrochemical microscopy (SECM) was used to study the kinetics of oxygen reduction on platinum in alkaline media. Oxygen was generated at a gold tip by oxidation of OH- and reduced at a Pt substrate. The formation of anodic film on the surface of the gold tip caused instability in tip behavior. This problem was overcome by applying a potential program at the tip to obtain the stable steady state tip current that is important for quantitative SECM analysis. The Tafel slope (125 mV, corresponding to a transfer coefficient, α, of 0.47) and the rate constant for oxygen reduction obtained by fitting the approach curves (2 × 10-3 cm s-1 at the open circuit potential) agree with previous results obtained by the rotating ring disk electrode technique and other electrochemical methods.
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