2024-03-28T09:16:32Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1420972021-12-27T15:48:55Zcom_10261_89com_10261_3col_10261_342
Cascos, Vanessa
Alonso, J. A.
Fernández-Díaz, M. T.
2017-01-04T08:49:28Z
2017-01-04T08:49:28Z
2016-07-15
Materials 9(7): 579 (2016)
http://hdl.handle.net/10261/142097
10.3390/ma9070579
http://dx.doi.org/10.13039/501100003339
http://dx.doi.org/10.13039/501100003329
28773701
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.
openAccess
SrCoO3−δ; SOFC
Cathode
Hydrogen
SrCo1−xNbxO3−δ
Solid oxide fuel cell
Neutron diffraction
Nb5+-Doped SrCoO3−δ Perovskites as Potential Cathodes for Solid-Oxide Fuel Cells
artículo