Electrode Properties of the Ruddlesden-Popper Series, Lan+1NinO3n+1 (n=1, 2, and 3), as Intermediate-Temperature Solid Oxide Fuel Cells

• Published in: Journal of the American Ceramic Society Vol. 93; no. 8; pp. 2329 - 2333
• Main Authors: Takahashi, Suguru, Nishimoto, Shunsuke, Matsuda, Motohide, Miyake, Michihiro
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.08.2010
• Subjects: Cathodes; Density; Electric power generation; Electrodes; Nickel; Ohmic; Perovskite structure; Solid oxide fuel cells
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2010.03743.x

The Ruddlesden–Popper phases, Lan+1NinO3n+1 (n=1, 2, and 3), were synthesized by a solid‐state reaction for use as cathodes in an intermediate‐temperature (500°–700°C) solid oxide fuel cell. The samples crystallized into an orthorhombic layered perovskite structure. The overall electrical conductivity increased with the increase of n in the intermediate temperature range. Single test‐cells, which consisted of samarium‐oxide‐doped ceria (SDC; Sm0.2Ce0.8Ox) as an electrolyte, Ni–SDC cermet (Ni–SDC) as an anode, and Lan+1NinO3n+1 as a cathode, were fabricated for measurements of cell performance at 500°–700°C. Current interruption measurements revealed that both the ohmic and overpotential losses at 700°C decreased with the increase of n. La4Ni3O10 was found to exhibit the best cathode characteristics in the Lan+1NinO3n+1 series. Maximum test‐cell power densities with La4Ni3O10 (n=3) were 10.2, 36.5, and 88.2 mW/cm2 at 500°, 600°, and 700°C, respectively.