Characterization of mixed-conducting yttria-stabilized zirconia-terbia in high temperature solid oxide fuel cell environments
Abstract
Terbia(TbO$\sb{1.75})$ doped yttria-stabilized zirconia (YZTb) which exhibits both oxygen-ion and p-type electronic conductivity has potential applications as cathodes in Solid oxide fuel cells (SOFCs). In this work, terbia has been dissolved into yttria (8 mole%)-stabilized zirconia (Y8SZ) and yttria (10 mole%)-stabilized zirconia (Y10SZ) using citrate synthesis process. The single cubic fluorite phase of Y10ZTb is observed at terbia (TbO$\sb{1.75})$ concentrations as high as 50 mole%. Impedance spectroscopy, oxygen-ion blocking electrodes and emf cells have been used to determine the total electrical, the p-type electronic and the oxygen-ion conductivity in Y8ZTb and Y10ZTb solid solutions. The p-type electronic conductivity in Y8ZTb and Y10ZTb increases with both increasing terbia concentration and increasing oxygen pressure. The overpotentials of the mixed-conducting Y8ZTb20 and Y8ZTb30 cathodes, measured in air using current-interruption and impedance-spectroscopy techniques, are lower than those of platinum and the currently used La${\rm \sb{1-x}Sr\sb{x}MnO\sb3}$ cathodes.
Subject Area
Materials science|Chemistry|Chemical engineering
Recommended Citation
Han, Ping, "Characterization of mixed-conducting yttria-stabilized zirconia-terbia in high temperature solid oxide fuel cell environments" (1995). Dissertations available from ProQuest. AAI9532191.
https://repository.upenn.edu/dissertations/AAI9532191