Current-potential curves, steady state oxygen reduction

The feedback approach can also be used to study the O2 reduction reaction at a substrate in alkaline media. Oxygen is generated at a An tip by oxidation of OH" and reduced at the substrate. There is a drift in the tip current due to the formation of an anodic film on the tip in the potential range where the oxidation of OH occurs. This drift is alleviated by applying a periodic potential program to the An tip, which resulted in a stable, steady-state tip current. Kinetic parameters can then be determined from SECM approach curves. Similarly, the behavior of the product, O2, from O2 reduction at the tip in 02-saturated 10 M NaOH solution can be investigated as a function of substrate potential. ... 

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