RT Journal Article
T1 The Effects of Sr Content on the Performance of Nd1−xSrxCoO3−δ Air- Electrode Materials for Intermediate Temperature Solid Oxide Fuel Cells under Operational Conditions
A1 Muñoz Gil, Daniel
A1 Azcondo, Teresa
A1 Ritter, Clemens
A1 Fabelo, Oscar
A1 Pérez-Coll, Domingo
A1 Mather, Glenn
A1 Amador, Ulises
A1 Boulahya, Khalid
AB The potential of the perovskite system Nd1−xSrxCoO3−δ (x = 1/3 and 2/3) as cathode material for solid oxide fuel cells (SOFCs) has been investigated via detailed structural, electrical, and electrochemical characterization. The average structure of x = 1/3 is orthorhombic with a complex microstructure consisting of intergrown, adjacent, perpendicularly oriented domains. This orthorhombic symmetry remains throughout the temperature range 373−1073 K, as observed by neutron powder diffraction. A higher Sr content of x = 2/3 leads to stabilization of the cubic perovskite with a homogeneous microstructure and with a higher oxygen vacancy content and cobalt oxidation state than the orthorhombic phase at SOFC operation temperature. Both materials are p-type electronic conductors with high total conductivities of 690 and 1675 S·cm−1 at 473 K in air for x = 1/3 and 2/3, respectively. Under working conditions, both compounds exhibit similar electronic conductivities, since x = 2/3 loses more oxygen on heating than x = 1/3, associated with a greater loss of p-type charger carriers. However, composite cathodes prepared with Nd1/3Sr2/3CoO3−δ and Ce0.8Gd0.2O2−δ present lower ASR values (0.10 Ω·cm2 at 973 K in air) than composites prepared with Nd2/3Sr1/3CoO3−δ and Ce0.8Gd0.2O2−δ (0.34 Ω·cm2). The high activity for the oxygen electrochemical reaction at intermediate temperatures is likely attributable to a large disordered oxygen-vacancy concentration, resulting in a very promising SOFC cathode for real devices.
PB American Chemical Society
YR 2020
FD 2020
LK https://hdl.handle.net/20.500.14352/94296
UL https://hdl.handle.net/20.500.14352/94296
LA eng
NO Daniel Muñoz-Gil, M. Teresa Azcondo, Clemens Ritter, Oscar Fabelo, Domingo Pérez-Coll, Glenn C. Mather, Ulises Amador, and Khalid BoulahyaInorganic Chemistry 2020 59 (17), 12111-12121DOI: 10.1021/acs.inorgchem.0c01049
NO Comunidad de Madrid
NO Ministerio de Economía y Competitividad (España)
DS Docta Complutense
RD 5 abr 2025