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The impedance of a porous gold electrode in contact with solid electrolyte La 0.88 Sr 0.12 Ga 0.82 Mg 0.18 O 2.85 and the effect of the manufacture conditions on its polarization resistance are studied at 600-800°ë in air. The overall oxygen reaction rate on a gold electrode is described as the sum of two partial constituents, namely, the oxygen exchange at the gas/electrolyte interface at the gold/gas/electrolyte triple-phased boundary.