Abstract
The behaviour of platinum, iridium and ruthenium electrodes has been studied in 0.5 M H2SO4, 2 M NaCl+10−2 M HCl and 5 M NaCl+10−2 M HCl using a repetitive triangular potential sweep. The behaviour of the platinum electrode is strongly influenced in chloride solutions by the specific adsorption of chloride ions. There is evidence of the formation of a formal oxide of iridium in sulphuric acid. In chloride solutions the behaviour of the iridium electrode does not show any dependence on the specific adsorption of chloride ions. Ruthenium electrodes corrode relatively easily. In strong chloride solution this causes a modification in the properties of the electrode. Fast potentiostatic charging curves on iridium in 2 M NaCl at pH 2.0 have indicated the formation of an oxide of iridium during chlorine evolution.
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