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Materials 2016, 9(7), 579;

Nb5+-Doped SrCoO3−δ Perovskites as Potential Cathodes for Solid-Oxide Fuel Cells

Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain
Institut Laue Langevin, BP 156X, 38042 Grenoble, France
Author to whom correspondence should be addressed.
Academic Editor: Haolin Tang
Received: 3 June 2016 / Revised: 8 July 2016 / Accepted: 11 July 2016 / Published: 15 July 2016
(This article belongs to the Special Issue Recent Advances in Materials for Solid Oxide Cells)
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SrCoO3−δ outperforms as cathode material in solid-oxide fuel cells (SOFC) when the three-dimensional (3C-type) perovskite structure is stabilized by the inclusion of highly-charged transition-metal ions at the octahedral positions. In a previous work we studied the Nb incorporation at the Co positions in the SrCo1−xNbxO3−δ system, in which the stabilization of a tetragonal P4/mmm perovskite superstructure was described for the x = 0.05 composition. In the present study we extend this investigation to the x = 0.10–0.15 range, also observing the formation of the tetragonal P4/mmm structure instead of the unwanted hexagonal phase corresponding to the 2H polytype. We also investigated the effect of Nb5+ doping on the thermal, electrical, and electrochemical properties of SrCo1−xNbxO3−δ (x = 0.1 and 0.15) perovskite oxides performing as cathodes in SOFC. In comparison with the undoped hexagonal SrCoO3−δ phase, the resulting compounds present high thermal stability and an increase of the electrical conductivity. The single-cell tests for these compositions (x = 0.10 and 0.15) with La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) as electrolyte and SrMo0.8Fe0.2CoO3−δ as anode gave maximum power densities of 693 and 550 mW∙cm−2 at 850 °C respectively, using pure H2 as fuel and air as oxidant. View Full-Text
Keywords: SrCoO3−δ; SOFC; cathode; hydrogen; SrCo1−xNbxO3−δ; solid oxide fuel cell; neutron diffraction SrCoO3−δ; SOFC; cathode; hydrogen; SrCo1−xNbxO3−δ; solid oxide fuel cell; neutron diffraction

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Cascos, V.; Alonso, J.A.; Fernández-Díaz, M.T. Nb5+-Doped SrCoO3−δ Perovskites as Potential Cathodes for Solid-Oxide Fuel Cells. Materials 2016, 9, 579.

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