Design, synthesis, structure and properties of Ba-doped derivatives of SrCo0.95Ru0.05O3-d perovskite as cathode materials for SOFCs

S. SYDYKNAZAR; V. CASCOS; L. TRONCOSO; A. L. LARRALDE; M.T. FERNÁNDEZ-DÍAZ; J.A. ALONSO

Materials

MDPI Open Access Publishing

Lugar: Basilea; Año: 2019

1996-1944

We have designed and prepared a novel cathode material for SOFC based on SrCo0.95Ru0.05O3-d perovskite. We have partially replaced Sr by Ba in Sr0.9Ba0.1Co0.95Ru0.05O3-d (SBCRO) in order to expand the unit-cell size and thereby improving the ionic diffusion of O2- through the crystal lattice. The characterization of this new oxide has been studied at room temperature by X-ray diffraction (XRD) and neutron powder diffraction (NPD) experiments. At room temperature, SBCRO perovskite crystallizes in the P4/mmm tetragonal space group, as observed from NDP experiment. The maximum conductivity value of 18.6 S cm-1 is observed at 850 °C. Polarization resistance measurements on LSGM electrolyte demonstrate an improvement in conductivity with respect to the electrode with respect to the parent Sr-only perovskite cathode. A good chemical compatibility and an adequate thermal expansion coefficient make this oxide auspicious for using it as cathode in solid-oxide fuel cells (SOFC).