Double substituted NdBa(Fe,Co,Cu)2O5+δ layered perovskites as cathode materials for intermediate-temperature solid oxide fuel cells – correlation between structure and electrochemical properties

• Published in: Electrochimica acta Vol. 411; p. 140062
• Main Authors: Klyndyuk, Andrei I., Kharytonau, Dzmitry S., Mosiałek, Michał, Chizhova, Ekaterina A., Komenda, Anna, Socha, Robert P., Zimowska, Małgorzata
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 10.04.2022; Elsevier BV
• Subjects: Argon; Cathode; Cathodes; Cobalt; Electrical resistivity; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode materials; Electrode polarization; Electrolytic cells; Fuel cells; Intermediate temperature solid oxide fuel cell; Iron; Layered perovskite; Oxygen; Perovskites; Solid oxide fuel cells; Structural properties; Thermal expansion; Layered perovskite; Cathode; Intermediate temperature solid oxide fuel cell; Structural properties; Electrochemical impedance spectroscopy
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2022.140062

•NdBa(Fe,Co,Cu)2O5+δ layered perovskites were prepared by solid state reaction.•Structural characteristics and electrochemical performance were investigated.•Substitution of Co by Cu and/or Fe decreased linear thermal expansion coefficient.•NdBaCo1.5Cu0.5O5+δ showed the best performance in oxygen reduction reaction. In this work, double-doped NdBa(Fe,Co,Cu)2O5+δ layered perovskites were prepared by solid state reaction method and comparatively examined. Physicochemical analysis included structural characteristics, linear thermal expansion coefficient, oxygen nonstoichiometry, electrical conductivity, and electrochemical performance of the materials. NdBaCo1.5Cu0.5O5+δ (NBCC2) and NdBaFeCoO5+δ (NBFC) materials exhibited good electrical conductivity and linear thermal expansion coefficient relatively matched to common electrolyte materials. Electrochemical impedance spectroscopy measurements in argon-oxygen mixtures demonstrated promising performance of the synthesized materials as cathode materials for solid-oxide fuel cells. The NBCC2 material showed the lowest polarization resistance of 0.17 (800°C) and 0.67 (700°C) Ω cm2 at P(O2) P−1 = 0.2.