Abstract
A new series of La2–xGdxNiO4+δ (0.0 ≤ x ≤ 0.6) synthesized via formate pyrolysis were tested as potential cathode materials for intermediate solid oxide fuel cells (IT-SOFCs). It was found that the materials are single-phase up to x = 0.5 and crystallize in a tetragonal structure (I4/mmm space group). They show superior oxygen over-stoichiometry values, δ, to those of both the undoped lanthanum nickelate and the one doped with alkali-earth elements. To satisfy the requirements for the increased efficiency and durability of SOFCs, chemical and thermo-mechanical compatibility between the cathode materials developed and a Ce0.8Gd0.2O1.9 solid-state electrolyte was studied. Concentration dependences of electrical and thermal properties of the La2–xGdxNiO4+δ compounds were discussed in interrelation with their structural peculiarities and the temperature behavior of δ.
Published Version
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