Abstract
The influence of iodide upon the dissolution of β-cobalt electrodes and hydrogen evolution in N H2SO4 aqueous solutions has been investigated. The relation between hydrogen overvoltage and iodide ion concentration has been studied over a wide range of iodide content in the solution. Iodide ion greatly increases the hydrogen overvoltage and decreases the rate of anodic dissolution of the cobalt electrode. From the results, a mechanism is sugested, according which iodide ions are adsorbed on the active places of the cobalt electrode, thus decreasing the dissolution rate.
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