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Título: | New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells |
Autor: | Troncoso, Loreto; Gardey, María Celeste; Fernández-Díaz, M. T.; Alonso, J. A. CSIC ORCID | Fecha de publicación: | 24-ago-2016 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Materials 9(9): 717 (2016) | Resumen: | In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO<sub>3−<i>δ</i></sub>, we have designed and prepared SrCo<sub>1−x</sub>Re<sub>x</sub>O<sub>3−<i>δ</i></sub> phases (x = 0.05 and 0.10), successfully avoiding the competitive hexagonal 2H polytypes. Their performance as cathode materials in intermediate-temperature solid oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and in situ temperature-dependent neutron powder diffraction (NPD) experiments for x = 0.10. At room temperature, SrCo<sub>1−x</sub>Re<sub>x</sub>O<sub>3−<i>δ</i></sub> perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ a<sub>o</sub>, c = 2a<sub>o</sub> (a<sub>o</sub> = 3.861 and 3.868 Å, for x = 0.05 and 0.10, respectively). The crystal structure evolves above 380 °C to a simple cubic perovskite unit cell, as observed from in-situ NPD data. The electrical conductivity gave maximum values of 43.5 S·cm<sup>−1</sup> and 51.6 S·cm<sup>−1</sup> for x = 0.05 and x = 0.10, respectively, at 850 °C. The area specific resistance (ASR) polarization resistance determined in symmetrical cells is as low as 0.087 Ω·cm<sup>2</sup> and 0.065 Ω·cm<sup>2</sup> for x = 0.05 and x = 0.10, respectively, at 850 °C. In single test cells these materials generated a maximum power of around 0.6 W/cm<sup>2</sup> at 850 °C with pure H<sub>2</sub> as a fuel, in an electrolyte-supported configuration with La<sub>0.8</sub>Sr<sub>0.2</sub>Ga<sub>0.83</sub>Mg<sub>0.17</sub>O<sub>3−</sub><i><sub>δ</sub></i> (LSGM) as the electrolyte. Therefore, we propose the SrCo<sub>1−x</sub>Re<sub>x</sub>O<sub>3−<i>δ</i></sub> (x = 0.10 and 0.05) perovskite oxides as promising candidates for cathodes in IT-SOFC. | URI: | http://hdl.handle.net/10261/142112 | DOI: | 10.3390/ma9090717 | Identificadores: | doi: 10.3390/ma9090717 |
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