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Open AccessArticle

New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells

Institute of Materials Science of Madrid, CSIC, Cantoblanco, Madrid 28049, Spain
Institute of Materials and Thermomechanics, Universidad Austral de Chile, General Lagos 2086, Valdivia 5111187, Chile
Grupo CLIOPE, National Technological University, Reg. Mendoza, Rodríguez 273, Mendoza 5500, Argentina
Institut Laue-Langevin, B.P. 156x, Grenoble 38042, France
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Materials 2016, 9(9), 717;
Received: 8 July 2016 / Revised: 12 August 2016 / Accepted: 18 August 2016 / Published: 24 August 2016
(This article belongs to the Section Energy Materials)
In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO3−δ, we have designed and prepared SrCo1−xRexO3−δ 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, SrCo1−xRexO3−δ perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ ao, c = 2ao (ao = 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−1 and 51.6 S·cm−1 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·cm2 and 0.065 Ω·cm2 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/cm2 at 850 °C with pure H2 as a fuel, in an electrolyte-supported configuration with La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) as the electrolyte. Therefore, we propose the SrCo1−xRexO3−δ (x = 0.10 and 0.05) perovskite oxides as promising candidates for cathodes in IT-SOFC. View Full-Text
Keywords: IT-SOFC; hydrogen; cathode; neutron diffraction; SrCoO3 IT-SOFC; hydrogen; cathode; neutron diffraction; SrCoO3
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MDPI and ACS Style

Troncoso, L.; Gardey, M.C.; Fernández-Díaz, M.T.; Alonso, J.A. New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells. Materials 2016, 9, 717.

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