Abstract
Mixed ionic and electronic conducting K₂NiF₄-type oxide, Nd 2-x Sr x NiO 4+δ (x = 0, 0.4, 0.6) powders were synthesized by a solidstate reaction technique and solid oxide fuel cells consisting of a Nd 2-x Sr x NiO 4+δ -GDC cathode, a Ni-YSZ anode and 8YSZ as an electrolyte were fabricated. The effect of strontium substitution for neodymium on the electrical and electrochemical properties was examined. The electrical conductivity increased with an increase in the Sr doping content, while it appears that the excess oxygen (δ) decreased. Sr doping into Nd 2-x Sr x NiO 4+δ resulted in an increase in the cathode polarization resistance and an decrease in the power density of the cell. These phenomena may be associated with the decreased amount of excess oxygen noted in the Nd 2-x Sr x NiO 4+δ cathode.
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