Abstract
The kinetics of the deposition and dissolution of indium (from indium amalgam) in indium sulfate solutions at pH 2.5 have been studied by observing variations of overpotential during individual constant current pulses. The electrode was in the form of a hanging drop of the amalgam, which was renewed for each pulse. The steady‐state activation overpotential was reached approximately 1 msec after application of the pulse, which corresponds to a mean value of double layer capacity of 25.4 µF/cm2. Plots of the activation overpotential vs. log current density show good Tafel relations in both the cathodic and anodic regions. Analysis of these data shows the mechanism to consist of three consecutive electron transfer steps The rate‐determining step for both anodic and cathodic polarization is for which the transfer coefficient α was determined to be approximately 0.83.
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