Increasing Conductivity in Proton Conductors BaCeO3-δ doped with Pr

J.F. BASBUS; L. MOGNI; A. CANEIRO

San Francisco

Congreso; 224thECS Meeting of the Electrochemical Society; 2013

In this work we explore the effect of partial substitution of Ce for Pr ions in BaCe1-xPrxO3- (0 ≤ x ≤ 0.8) perovskites with the aim of increasing the oxygen vacancies concentration and H+ charge carriers and decrease the sintering temperature. The oxideswere obtained by Pechini combustion method and sintered at 1350 °C. The Pr incorporation allows obtaining dense samples at this temperature and improve the performance diminishing the bulk and grain boundary resistances. Crystal structure werestudied by XRD, the morphology by SEM, while the oxygen content and stability through TG in 20 % O2/Ar and 5 % H2/Ar. The conductivity was characterized by EIS under 20 % O2/Ar and 10 % H2/Ar, both whit 2% humidity. We found that the Pr contentdiminished the lattice parameters, increase the sintering capacity and the conductivity under wet oxidant atmosphere, but decrease the stability in reducing atmosphere.