Li, Y.; Troncoso, L.; Fernández, M.T.; Alonso, J.A. Characterization of Sr1-xYxCoO3- (X= 0.1, 0.2) Perovskites as Plausible Cathode Materials in Solid Oxide Fuel Cells. Preprints2023, 2023111099. https://doi.org/10.20944/preprints202311.1099.v1
APA Style
Li, Y., Troncoso, L., Fernández, M.T., & Alonso, J.A. (2023). Characterization of Sr1-xYxCoO3- (X= 0.1, 0.2) Perovskites as Plausible Cathode Materials in Solid Oxide Fuel Cells. Preprints. https://doi.org/10.20944/preprints202311.1099.v1
Chicago/Turabian Style
Li, Y., Maria Teresa Fernández and José Antonio Alonso. 2023 "Characterization of Sr1-xYxCoO3- (X= 0.1, 0.2) Perovskites as Plausible Cathode Materials in Solid Oxide Fuel Cells" Preprints. https://doi.org/10.20944/preprints202311.1099.v1
Abstract
Cathode materials based on SrCoO3- perovskite-type oxides hold great potential, given the huge oxygen permeability exhibited by the cubic phase of this oxide, which must be stabilized though suitable cationic substitutions. We present here two novel materials of the series Sr1-xYxCoO3- (x= 0.1, 0.2), prepared by solid state reactions. The crystalline structure was explored by neutron powder diffraction. At RT, we identified a subtle tetragonal superstructure, yet preserving the wanted framework of vertex-sharing CoO6 octahedra. A noteworthy result of the neutron analysis is the presence of conspicuous amounts of oxygen vacancies, ordered in layers and responsible for the formation of the mentioned superstructure. The stability was investigated by thermal analysis, using thermogravimetry (TGA). The electrical conductivity gave a maximum value of 800 °C of 122 S·cm–1. To determine the resistance associated with the oxygen reduction reaction (ORR), electrochemical impedance spectroscopy as a function of temperature was carried out, finding a value for the activation energy of Ea= 0.82 eV. This is a much lower value than that usually obtained for cathodes with a high catalytic activity for the oxygen reduction reaction. In single-cell tests, the materials generated a power density up to 0.25 Wcm−2 at 800ºC, using pure H2 as fuel. All these features make this perovskite a suitable candidate as cathode material in intermediate-temperature SOFCs
Chemistry and Materials Science, Materials Science and Technology
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