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

AuthorsSydyknazar, Sabina; Cascos, Vanessa ; Troncoso, Loreto; Larralde, Ana Laura; Fernández-Díaz, María Teresa; Alonso, J. A.
Neutron diffraction
Issue Date18-Jun-2019
PublisherMultidisciplinary Digital Publishing Institute
CitationMaterials 12(12): 1957 (2019)
AbstractWe have designed and prepared a novel cathode material for solid oxide fuel cell (SOFC) based on SrCo0.95Ru0.05O3−δ perovskite. We have partially replaced Sr by Ba in Sr0.9Ba0.1Co0.95Ru0.05O3−δ (SBCRO) in order to expand the unit-cell size, 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 data. 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 parent Sr-only perovskite cathode. A good chemical compatibility and an adequate thermal expansion coefficient make this oxide auspicious for using it as a cathode in SOFC.
Publisher version (URL)https://doi.org/10.3390/ma12121957
Appears in Collections:(ICMM) Artículos
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