Current Oscillations Observed within the Limiting Current Plateau for Iron in Sulfuric Acid

1 October 1986

journal article
Published by The Electrochemical Society in Journal of the Electrochemical Society

Vol. 133 (10) , 2093-2097
https://doi.org/10.1149/1.2108346

Abstract

The anodic polarization curve for iron rotating disk electrodes in acidic sulfate electrolytes displays a limiting current plateau. Sustained current oscillations are observed when the potential is fixed within a certain range on this limiting current plateau. The frequency of oscillations is found to be proportional to the square root of the disk electrode rotation speed. Current oscillations are also observed for a hemispherical rotating electrode. The current‐time waveform obtained in one of these experiments displays a harmonic component giving rise to a “beat” phenomenon. Current‐time waveforms produced by larger disk electrodes (5 mm diam) rotating at slower speeds (41.7 rad/s) contain a region of high frequency noise near the minimum oscillation current in the overall waveform.

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