Increasing Conductivity in Proton Conductors BaCeO3-d doped with Pr

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

Workshop; Workshop on Materials in 3D: Modeling and Imaging at Multiple Length Scales International Center for Materials Research (ICMR); 2013

In this work we explore the effect of partial substitution of Ce for Pr ions in BaCe1-xPrxO3-d (0 < x <0.8) perovskites with the aim of increasing the oxygen vacancies concentration and H+ chargecarriers and decrease the sintering temperature.The oxides were obtained by Pechini combustion method and sintered at 1350 °C. The Pr incorporation allows obtaining dense samples at this temperature. Decreasing the temperature ofsintering is a key to avoid the Ba evaporation and improve the performance diminishing the bulk and grain boundary resistances. Crystal structure were studied by X-ray diffraction, whilemorphology by SEM. The conductivity was characterized by Electrochemical Impedance Spectroscopy (EIS) under 20 % O2/Ar and 10 % H2/Ar, both whit 2% humidity. We found that the Prcontent diminished the lattice parameters, increase the sintering capacity and the conductivity under wet oxidant atmosphere, but decrease the stability in reducing atmosphere.