Abstract

Oxygen reduction at Au electrodes in acid solution has been studied with a rotating disk electrode with a concentric ring. Two linear regions in the V-log i plot are observed, both with Tafel slope of −0.115 V. From the I d / I r vs. ω − 1 2 plots it is concluded that (i) oxygen reduction at and below 0.3 V (H.E.) proceeds along a single reaction path with hydrogen peroxide as a reaction intermediate which further reduces at an increasing rate as the potential becomes more cathodic; and (ii) at potentials anodic to 0.30 V, the reduction proceeds along two parallel reaction paths. Below 0.55 V, the major reaction is that in which oxygen is reduced to hydrogen peroxide. Above 0.55 V, the major reaction is the reduction to water without hydrogen peroxide intermediate. Linear V-log i regions correspond to these two situations.

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