The Effect of Copper on the Properties
of La_1.7Ca_0.3NiO₄₊-Based Cathodes for Solid Oxide Fuel Cells

A. A. Kolchugin^z, E. Yu. Pikalova, N. M. Bogdanovich, and D. I. Bronin

Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences,
ul. Akademicheskaya 20, Ekaterinburg, 620990 Russia

Received July 22, 2014

Abstract—The aim of the work was to develop the electrochemically active cathodes with a low in-plane resis-
tance for application in the intermediate-temperature solid oxide fuel cells in contact with CeO₂-based solid
electrolytes. Mixed La_1.7Ca_0.3NiO₄₊ conductor was chosen as the material for functional cathodic layer. The
conductor has the layered perovskite-like structure and is compatible with these electrolytes in the thermal lin-
ear expansion coefficient (TLEC). Lanthanum nickelate ferrite LaNi_0.6Fe_0.4O₃, which exhibits a high electronic
conductivity and is close to the functional layer material in the TLEC, was used as the collector layer. The pecu-
liarities of sintering and the electrical and electrochemical characteristics of the cathodes were studied as a func-
tion of the amount of CuO, which was introduced into the functional layer.

Keywords: solid oxide fuel cells, cathodes, La₂NiO_{4 +} , La_1.7Ca_0.3NiO_{4 +} , sintering additive, CuO, layer resis-
tance, polarization resistance

DOI: 10.1134/S1023193515050067

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