Abstract
Due to their layered structure, Ruddlesden-Popper oxides possess intriguing properties and appear promising for application in a protonic ceramic fuel cell (PCFC) as an air electrode. In this work, two series of K2NiF4-type oxides, namely La2-xSrxNiO4±δ with 0.75 ≤ x ≤ 1.4 and La2-xBaxNiO4±δ with 0.25 < x ≤ 1.1, were thoroughly investigated in terms of structure, oxygen nonstoichiometry, and proton incorporation at elevated temperatures. For the Sr-substituted samples, only an oxygen-deficient regime is observed, while for La2-xBaxNiO4±δ at a low temperature, as well as with a low Ba content (x = 0.25) an oxygen excess regime can be noticed. The proton uptake of La2-xSrxNiO4±δ remains below 0.005 protons per formula in 16.7 mbar H2O. In contrast, La2-xBaxNiO4±δ, with a stronger basic character, incorporates up to 0.06 protons per formula unit at 400 °C in humid atmosphere. The proton uptake of the La2-xBaxNiO4±δ raises with an increase of Ba content. The proton concentrations in LaBaNiO4±δ and La0.9Ba1.1NiO4±δ exceed those of (Ba,La)FeO3-δ perovskites, which is tentatively attributed to the higher A/B site cation ratio in the Ruddlesden-Popper structure.
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