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



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Sánchez Ahijón, Elena and Marín Gamero, Rafael, Rafael and Molero Sánchez, Beatriz and Avila Brande, David and Manjón Sanz, Alicia and Fernández Díaz, M. Teresa and Morán, Emilio and Schmidt, Rainer and Prado Gonjal, Jesús (2020) From theory to experiment: BaFe0.125Co0.125Zr0.75O3-delta, a highly promising cathode for intermediate temperature SOFCs. Journal of Materials Chemistry A, 8 (6). pp. 3413-3420. ISSN 2050-7496 (Online) 2050-7488(Print)

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Official URL: https://doi.org/10.1039/c9ta12208g



In a recent theoretical study [Jacobs et al., Adv. Energy Mater., 2018, 8, 1702708], BaFe0.125Co0.125Zr0.75O3-delta 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 x 10(-6) K-1 suggests acceptable compatibility with common electrolytes. Electrochemical impedance spectroscopy of symmetrical cells gives an area-specific resistance of 0.33 Omega cm(2) at 700 degrees C and 0.13 Omega cm(2) at 800 degrees C. These values are reduced to 0.13 Omega cm(2) at 700 degrees C and 0.05 Omega cm(2) at 800 degrees C when the material is mixed with 30 wt% Ce0.9Gd0.1O2-delta.

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This journal is © The Royal Society of Chemistry 20xx. 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 José Antonio 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 García Martin for allowing the use of and helping with the Solartron 1255 analyser.

Uncontrolled Keywords:Oxide fuel-cells; Crystal-structure; Oxygen reduction; Composite cathodes; Perovskite; Performance; Conductivity; Optimization; La1-xsrxmno3; Electrolyte
Subjects:Sciences > Physics > Materials
ID Code:60383
Deposited On:11 May 2020 11:07
Last Modified:13 May 2020 08:37

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