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Abstract. Pt electrodes with defined contact geometries were studied by using impedance spectroscopy. The specific polarisation conductivity per unit length of the three-phase boundary was determined. It is found to be 1 x 10 .4 S.cm a at 977 ~ in an atmosphere of "pure" hydrogen with an oxygen partial pressure of 10 .20 atm at 1000 ~ Investigations carried out in an atmosphere of pure oxygen revealed a pronounced dependence of the polarisation conductivity on the electrode history. The polarisation conductivity was found to be in a range of 2 x 10 .4 to 6.5 x 10 .4 S.cm ~ at a temperature of 977 ~ It was possible to estimate the area of the electrolyte surface which takes part in the electrode reaction. The real exchange current density was determined.

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