Abstract
Abstract To realize practical anode electrode film for solid oxide fuel cells (SOFCs) operating at a medium temperature range, we have prepared c-axis oriented BaCe0.7Ru0.1Y0.2O3-d (BCRY) thin films on an MgO (100) substrate by RF magnetron sputtering. The oxygen vacancies concentration was quantitatively evaluated by X-ray absorption spectroscopy and defect chemical analysis. Proton conductivity was proven from the O 1s photoemission spectrum showing an OH- peak formed on the oxygen ion sites. Electron conductivity was proven from small density-of-state at the Fermi level (EF) and the energy difference between the top of the valence band and the EF, which is close to the activation energy of the conductivity. The wet-annealed BCRY thin film, which exhibit surface electron-proton mixed conductivity of more than 10-3 S/cm at 300 °C, can be applied as a practical anode electrode film with high chemical reaction for SOFC operating in the medium temperature range.
Published Version
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