Perovskite-type oxide materials containing nickel and iron for air electrode and solid oxide fuel cell using the same

摘要

A solid oxide fuel cell, which converts a chemical reaction between a fuel and air or oxygen into electric energy, and which is constructed by a solid electrolyte, an air electrode mounted adjacent to the solid electrolyte, a fuel electrode, and an inter-connector for connecting with other cell units is provided. The air electrode of the above fuel cell is made of a perovskite-type oxide material with a composition expressed by LnNi1-xFexO3 and YNi1-xFexO3 and wherein Ln represents lanthanide elements and x is in a range of 0.30 to 0.60. The perovskite-type oxide materials containing nickel and iron satisfy requirements to provide higher electronic conductivity than the conventional material and closer thermal expansion coefficient to that of the solid electrolyte than that of the conventional air electrode material.