The Effects of Sr Content on the Performance of Nd<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>CoO<sub>3−δ</sub> Air-Electrode Materials for Intermediate Temperature Solid Oxide Fuel Cells under Operational Conditions

  1. Muñoz-Gil, Daniel 2
  2. Azcondo, M. Teresa 3
  3. Ritter, Clemens 4
  4. Fabelo, Oscar 4
  5. Pérez-Coll, Domingo 2
  6. Mather, Glenn C. 2
  7. Amador, Ulises 3
  8. Boulahya, Khalid 1
  1. 1 Departamento de Química Inorgánica, Facultad Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
  2. 2 Instituto de Cerámica y Vidrio, CSIC, Cantoblanco, 28049 Madrid, Spain
  3. 3 Departamento de Química y Bioquímica, Facultad de Farmacia, Universidad CEU San Pablo, E-28668, Boadilla del Monte, Madrid, Spain
  4. 4 Institut Laue-Langevin, BP 156-38042 Grenoble, Cedex 9, France
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Revista:
Inorganic Chemistry

ISSN: 0020-1669,  1520-510X

Año de publicación: 2020

Volumen: 59

Número: 17

Páginas: 12111-12121

Tipo: Artículo

DOI: 10.1021/ACS.INORGCHEM.0C01049 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Inorganic Chemistry

Resumen

STRACT: 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 detailedstructural, electrical, and electrochemical characterization. The average structure of x = 1/3is orthorhombic with a complex microstructure consisting of intergrown, adjacent,perpendicularly oriented domains. This orthorhombic symmetry remains throughout thetemperature range 373−1073 K, as observed by neutron powder diffraction. A higher Srcontent of x = 2/3 leads to stabilization of the cubic perovskite with a homogeneousmicrostructure and with a higher oxygen vacancy content and cobalt oxidation state thanthe orthorhombic phase at SOFC operation temperature. Both materials are p-typeelectronic conductors with high total conductivities of 690 and 1675 S·cm−1 at 473 K in airfor x = 1/3 and 2/3, respectively. Under working conditions, both compounds exhibitsimilar 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 cathodesprepared with Nd1/3Sr2/3CoO3−δ and Ce0.8Gd0.2O2−δ present lower ASR values (0.10 Ω·cm2 at 973 K in air) than compositesprepared with Nd2/3Sr1/3CoO3−δ and Ce0.8Gd0.2O2−δ (0.34 Ω·cm2). The high activity for the oxygen electrochemical reaction atintermediate temperatures is likely attributable to a large disordered oxygen-vacancy concentration, resulting in a very promisingSOFC cathode for real devices.

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