Nickel oxide powder material for solid oxide fuel cell, production process thereof, raw material composition for use in the same, and anode material using the nickel oxide powder material

摘要

This invention provides a nickel oxide powder material, a production process thereof with high efficiency, a raw material composition for use in the same, and a fuel electrode material using the nickel oxide powder material. The nickel oxide powder material, when used as a fuel electrode material for a solid electrolyte fuel battery, can reduce heat shrinkage in firing to reduce a shrinkage difference from other constituent members, and can suppress the occurrence of cracking, separation, warpage and the like during firing. Also in power generation after re-reduction after exposure of the fuel electrode once to an oxidizing atmosphere, for example, due to abnormal fuel gas supply, a deterioration in structure of the fuel electrode can be suppressed, and the percentage voltage drop of the cell can be reduced. The nickel oxide powder material is used in a fuel electrode material constituting a solid electrolyte fuel battery and is characterized in that spinel represented by compositional formula: NiMO wherein M represents a metal element is formed within or on the surface of the nickel oxide powder or at the interface between the powder particles.