Abstract
The behaviour of the Pt electrode in oxygenated 0.1 M NaHCO3 solution at 162° and 238°c has been investigated using open-circuit and potentiostatic polarisation techniques. The effects of temperature and concentration of O2 in the solution on the anodic and cathodic polarisation curves are discussed, and the parameters which control the rest potential of the electrode are identified. The electrode is not thermodynamically reversible but can provide a useful reference potential for electrochemical studies of corrosion processes in oxygenated solutions at elevated temperatures. Limiting currents for the diffusion of O2 were determined for several concentrations of O2 between 20° and 238°c and used to determine the activation energy of diffusion of O2.
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