Functionally graded composite cathodes for solid oxide fuel cells

• Published in: Journal of power sources Vol. 106; no. 1; pp. 42 - 50
• Main Authors: Hart, N.T., Brandon, N.P., Day, M.J., Lapeña-Rey, N.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01-04-2002; Elsevier Sequoia
• Subjects: Applied sciences; Composite cathodes; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Functionally graded interfaces; Solid oxide fuel cell; Spraying; Functionally graded interfaces; Composite cathodes; Solid oxide fuel cell; Spraying; Gadolinium oxides; Strontium; Cathode; Electrode material; Cerium oxide; Performance; Composite material; Lanthanum Manganites
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/S0378-7753(01)01035-7

Functionally graded solid oxide fuel cell (SOFC) cathodes have been prepared from mixtures of strontium-doped lanthanum manganite (LSM) and gadolinia-doped ceria (CGO) using slurry spraying techniques. Similar samples were also prepared from mixtures of LSM and ytrria-stabilised zirconia (YSZ). A current collector comprising a mixture of LSM and strontium-doped lanthanum cobaltite (LSCO) was then applied to both cathode types. Samples were characterised using scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). Characterisation using EIS techniques showed that cathodes incorporating CGO into the structure gave improved performance over those fabricated using YSZ. These performance gains were most noticeable as the temperature was decreased towards 700
°C, and were maintained during the testing of three cell membrane electrode assemblies fabricated to the Rolls-Royce design.