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

doi:10.1149/2.0031710JES

Design of Sr_0.7R_0.3CoO_3-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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

4 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 language	English
Pages (from-to)	F3019-F3027
Journal	Journal of the Electrochemical Society
Volume	164
Issue number	10
DOIs	https://doi.org/10.1149/2.0031710JES
Publication status	Published - 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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10.1149/2.0031710JESLicence: CC BY-NC-ND

Cite this

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

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.",

author = "V. Cascos and A. Aguadero and G. Harrington and Fern{\'a}ndez-D{\'i}az, {M. T.} and Alonso, {J. A.}",

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AU - Cascos, V.

AU - Aguadero, A.

AU - Harrington, G.

AU - Fernández-Díaz, M. T.

AU - Alonso, J. A.

N1 - 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.

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N2 - 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.

AB - 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.

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