%0 Journal Article
%A Sánchez Ahijón, Elena
%A Marín Gamero, Rafael, Rafael
%A Molero Sánchez, Beatriz
%A Avila Brande, David
%A Manjón Sanz, Alicia
%A Fernández Díaz, M. Teresa
%A Morán, Emilio
%A Schmidt, Rainer
%A Prado Gonjal, Jesús
%T From theory to experiment: BaFe0.125Co0.125Zr0.75O3-delta, a highly promising cathode for intermediate temperature SOFCs
%D 2020
%@ 2050-7496 (Online) 2050-7488(Print)
%U https://hdl.handle.net/20.500.14352/6221
%X 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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