From theory to experiment: BaFe0.125Co0.125Zr0.75O3-: δ, a highly promising cathode for intermediate temperature SOFCs

Elena Sánchez-Ahijón; Rafael Marín-Gamero; Beatriz Molero-Sánchez; David Ávila-Brande; Alicia Manjón-Sanz; M. Teresa Fernández-Díaz; Emilio Morán; Rainer Schmidt; Jesús Prado-Gonjal

doi:10.1039/c9ta12208g

From theory to experiment: BaFe_0.125Co_0.125Zr_0.75O_{3-: δ}, a highly promising cathode for intermediate temperature SOFCs

Elena Sánchez-Ahijón, Rafael Marín-Gamero, Beatriz Molero-Sánchez, David Ávila-Brande, Alicia Manjón-Sanz, M. Teresa Fernández-Díaz, Emilio Morán, Rainer Schmidt, Jesús Prado-Gonjal

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

18 Scopus citations

Abstract

In a recent theoretical study [Jacobs et al., Adv. Energy Mater., 2018, 8, 1702708], BaFe_0.125Co_0.125Zr_0.75O_3-δ was predicted to be a stable phase with outstanding performance as an auspicious cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). It is shown here that the theoretical predictions are valid. The material can be synthesized by the citrate method as a single cubic Pm3m phase with a significant amount of oxygen vacancies, randomly distributed in the anionic sublattice facilitating oxygen vacancy conduction. A thermal expansion coefficient of 8.1 × 10^-6 K^-1 suggests acceptable compatibility with common electrolytes. Electrochemical impedance spectroscopy of symmetrical cells gives an area-specific resistance of 0.33 Ω cm² at 700 °C and 0.13 Ω cm² at 800 °C. These values are reduced to 0.13 Ω cm² at 700 °C and 0.05 Ω cm² at 800 °C when the material is mixed with 30 wt% Ce_0.9Gd_0.1O_2-δ

Original language	English
Pages (from-to)	3413-3420
Number of pages	8
Journal	Journal of Materials Chemistry A
Volume	8
Issue number	6
DOIs	https://doi.org/10.1039/c9ta12208g
State	Published - Feb 14 2020
Externally published	Yes

Funding

This research was funded by the Spanish Ministry of Science, Innovation and Universities through grants MAT2017-87134-C2-2-R, MAT2017-84385-R and MAT2016-78362-C4-4R. JPG would also like to thank the Community of Madrid for granting an “Atracción de Talento” fellowship (2017-T2-IND-5597). The authors wish to express their gratitude to the ALBA synchrotron, ILL neutron facilities and Centro Nacional de Microscopía Electrónica (CNME) at the Universidad Complutense de Madrid (UCM). We thank JoséAntonio Alonso for useful discussion, Jacobo Santamaría, Carlos León and Alberto Rivera-Calzada for allowing the use of and helping with the Novocontrol impedance analyzer and Susana Garćıa Martín for allowing the use of and helping with the Solartron 1255 analyser.

Funders	Funder number
Ministerio de Ciencia, Innovación y Universidades	MAT2016-78362-C4-4R, MAT2017-84385-R, MAT2017-87134-C2-2-R

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10.1039/c9ta12208g

Cite this

Sánchez-Ahijón, E., Marín-Gamero, R., Molero-Sánchez, B., Ávila-Brande, D., Manjón-Sanz, A., Fernández-Díaz, M. T., Morán, E., Schmidt, R., & Prado-Gonjal, J. (2020). From theory to experiment: BaFe_0.125Co_0.125Zr_0.75O_{3-: δ}, a highly promising cathode for intermediate temperature SOFCs. Journal of Materials Chemistry A, 8(6), 3413-3420. https://doi.org/10.1039/c9ta12208g

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title = "From theory to experiment: BaFe0.125Co0.125Zr0.75O3-: δ, a highly promising cathode for intermediate temperature SOFCs",

abstract = "In a recent theoretical study [Jacobs et al., Adv. Energy Mater., 2018, 8, 1702708], BaFe0.125Co0.125Zr0.75O3-δ was predicted to be a stable phase with outstanding performance as an auspicious cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). It is shown here that the theoretical predictions are valid. The material can be synthesized by the citrate method as a single cubic Pm3m phase with a significant amount of oxygen vacancies, randomly distributed in the anionic sublattice facilitating oxygen vacancy conduction. A thermal expansion coefficient of 8.1 × 10-6 K-1 suggests acceptable compatibility with common electrolytes. Electrochemical impedance spectroscopy of symmetrical cells gives an area-specific resistance of 0.33 Ω cm2 at 700 °C and 0.13 Ω cm2 at 800 °C. These values are reduced to 0.13 Ω cm2 at 700 °C and 0.05 Ω cm2 at 800 °C when the material is mixed with 30 wt% Ce0.9Gd0.1O2-δ",

author = "Elena S{\'a}nchez-Ahij{\'o}n and Rafael Mar{\'i}n-Gamero and Beatriz Molero-S{\'a}nchez and David {\'A}vila-Brande and Alicia Manj{\'o}n-Sanz and Fern{\'a}ndez-D{\'i}az, {M. Teresa} and Emilio Mor{\'a}n and Rainer Schmidt and Jes{\'u}s Prado-Gonjal",

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Sánchez-Ahijón, E, Marín-Gamero, R, Molero-Sánchez, B, Ávila-Brande, D, Manjón-Sanz, A, Fernández-Díaz, MT, Morán, E, Schmidt, R & Prado-Gonjal, J 2020, 'From theory to experiment: BaFe_0.125Co_0.125Zr_0.75O_{3-: δ}, a highly promising cathode for intermediate temperature SOFCs', Journal of Materials Chemistry A, vol. 8, no. 6, pp. 3413-3420. https://doi.org/10.1039/c9ta12208g

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AU - Marín-Gamero, Rafael

AU - Molero-Sánchez, Beatriz

AU - Ávila-Brande, David

AU - Manjón-Sanz, Alicia

AU - Fernández-Díaz, M. Teresa

AU - Morán, Emilio

AU - Schmidt, Rainer

AU - Prado-Gonjal, Jesús

PY - 2020/2/14

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