RT Journal Article
T1 Defect Chemistry, Electrical Properties, and Evaluation of New Oxides Sr2CoNb1@xTixO6@d (0,x,1) as Cathode Materials for Solid Oxide Fuel Cells
A1 Azcondo, María Teresa
A1 Amador, Ulises
A1 Muñoz-Gil, Daniel
A1 García-Martín, Susana
A1 Yuste, Mercedes
A1 Pérez-Flore s, Juan Carlos
A1 Muñoz Noval, Álvaro
A1 Puente Orench, Inés
AB The perovskite series Sr2CoNb1@xTixO6@d (0,x,1) was investigated in the full compositional range to assess its potential as cathode material for solid oxide fuel cell (SOFC). The variation of transport properties and thus, the area specific resistances (ASR) are explained by a detailed investigation of the defect chemistry. Increasing the titanium content from x=0–1 produces both oxidation of Co 3+ to Co4+ (from 0 up to 40%) and oxygen vacancies (from 6.0 to 5.7 oxygen atom/formula unit), although each charge compensation mechanism predominates in different compositional ranges. Neutron diffraction reveals that samples with high Ti-contents lose a significant amount of oxygen upon heating above 600 K. Oxygen is partially recovered upon cooling as the oxygen release and uptake show noticeably different kinetics. The complex defect chemistry of these compounds, together with the compositional changes upon heating/cooling cycles and atmospheres, produce a complicated behavior of electrical conductivity. Cathodes containing Sr2CoTiO6@d display low ASR values, 0,13 Wcm2 at 973 K, comparable to those of the best compounds reported so far, being a very promising cathode material for SOFC.
PB Wiley-V C H VERLAG GMBH
SN 1864-5631
YR 2017
FD 2017-07
LK https://hdl.handle.net/20.500.14352/19411
UL https://hdl.handle.net/20.500.14352/19411
LA eng
DS Docta Complutense
RD 6 abr 2025