Design of Sr0.7R0.3CoO3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cells

V. Cascos, A. Aguadero, G. Harrington, M. T. Fernández-Díaz, J. A. Alonso

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)

Abstract

Sr0.7R0.3CoO3-δ (R = Tb and Er) tetragonal perovskites have been prepared and evaluated as mixed ionic-electronic cathodes for SOFC. Neutron powder diffraction (NPD) measurements evidenced that both compounds are oxygen hypo-stoichiometric with long-range order of oxygen vacancies that leads to a tetragonal perovskite-type superstructure (s.g. I4/mmm) stable within the whole temperature range under study. The oxygen vacancies located mainly in the equatorial oxygen positions exhibit large displacement factors. The high oxygen mobility in Sr0.7Tb0.3CoO3-δ was confirmed by 18O oxygen labeling followed by Secondary Ion Mass Spectrometry (SIMS) with values of oxygen self-diffusion of 1.29 × 10-10 cm2/s at 525°C. Polarization resistances with LSGM as electrolyte gave values as low as 0.011 Ω·cm2 and maximum output powers of 570 mW/cm2 at 850°C were obtained in test cells set in electrolyte-supported configuration. Electrical conductivity, thermal and chemical expansion and stability measurements confirm the potential of these materials as cathodes for SOFC.

Original languageEnglish
Pages (from-to)F3019-F3027
JournalJournal of the Electrochemical Society
Volume164
Issue number10
DOIs
Publication statusPublished - 1 Jan 2017

Bibliographical note

Funding Information:
We thank the financial support of the Spanish Ministry of Economy and Competitiveness to the project MAT2013-41099-R.We thank the Institut Laue-Langevin (ILL) for making all facilities available.

Publisher Copyright:
© The Author(s) 2017.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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