Abstract
The cathodic current blackening of Bi2O3-based oxide ion conductors was examined for the Bi2O3-Y2O3 electrolyte at low oxygen pressure. In air, more than 500 mA cm−2 d.c. could be passed at 600° C without causing changes in the electrolyte itself. However, in argon gas, a limiting current of 3 mA cm−2 was observed and the electrolyte was blackened at the cathode side. The limiting current was ascribed to control by the diffusion of oxygen gas at the cathode. The blackened oxide was found to consist of a mixture of Bi metal and Bi2O3-Y2O3 solid solution and to exhibit the equilibrium oxygen partial pressure almost corresponding to that of the Bi, Bi2O3 mixture.
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Takahashi, T., Esaka, T. & Iwahara, H. Conduction in Bi2O3-based oxide ion conductors under low oxygen pressure. I. Current blackening of the Bi2O3-Y2O3 electrolyte. J Appl Electrochem 7, 299–302 (1977). https://doi.org/10.1007/BF01059169
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DOI: https://doi.org/10.1007/BF01059169