Abstract
Cyclic voltammograms were obtained on gold bead microelectrodes in and solutions as a function of the sweep rate and the potential range scanned. It is found that and are very slightly absorbed on Au and that neither is dissolved in the bulk metal. As a result, Au makes a more stable indicator electrode than Pt, which does dissolve oxygen. It is the formation of this Pt‐O alloy that necessitates a prepolarization of Pt before a steady‐state cyclic voltammogram is obtained. It is noted that all contamination of Au with noble metals must be rigorously avoided.
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