Issue 6, 2020

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 Pm[3 with combining macron]m 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.

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

Supplementary files

Article information

Article type
Paper
Submitted
06 Nov 2019
Accepted
16 Jan 2020
First published
18 Jan 2020

J. Mater. Chem. A, 2020,8, 3413-3420

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

E. Sánchez-Ahijón, R. Marín-Gamero, B. Molero-Sánchez, D. Ávila-Brande, A. Manjón-Sanz, M. T. Fernández-Díaz, E. Morán, R. Schmidt and J. Prado-Gonjal, J. Mater. Chem. A, 2020, 8, 3413 DOI: 10.1039/C9TA12208G

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