Structural, surface and oxygen transport properties of Sm-doped Nd nickelates

• Published in: Solid state ionics Vol. 412; p. 116596
• Main Authors: Sadykov, V.A., Sadovskaya, E.M., Bespalko, Yu.N., Smal’, E.A., Eremeev, N.F., Prosvirin, I.P., Bulavchenko, O.A., Mikhailenko, M.A., Korobeynikov, M.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2024
• Subjects: Cathodes; electron beams; Isotope heteroexchange; Nd nickelates; Oxygen diffusion; Radiation thermal sintering; Ruddlesden – Popper phases; Solid oxide fuel cells; hydrides; Solid oxide fuel cells; BE; A81.05.Je Ceramics and refractories (including borides; oxides; A61.10.Nz Single-crystal and powder diffraction; and fabrication; RTS; Radiation thermal sintering; Auger electron spectroscopy (AES); design; nitrides; Oxygen diffusion; Ruddlesden – Popper phases; electron beams; A61.80.Fe Electrons and positron radiation effects; A66.30.Dn Theory of diffusion and ionic conduction in solids; A81.05.Zx New materials: theory; etc.; carbides; and silicides; Nd nickelates; Isotope heteroexchange; RP; Cathodes; TPIE; A82.80.Pv Electron spectroscopy (x-ray photoelectron (XPS)
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2024.116596

Ruddlesden – Popper phases are promising materials for solid oxide fuel cell/electrolyzer air electrodes, oxygen separation membranes and other electrochemical devices due to their high oxygen mobility provided by a cooperative mechanism of oxygen migration involving both regular and highly-mobile interstitial oxygen. This work aims at studying structural, surface and oxygen transport properties of Sm-doped Nd nickelates sintered in a furnace at the temperatures in the range of 800–1250 °C and using electron beams at the temperatures in the range of 1150–1250 °C. Nd2-xSmxNiO4+δ, x = 0.2 and 0.4 are synthesized by a modified Pechini technique and characterized by X-ray diffraction, X-ray photoelectron spectroscopy and temperature-programmed isotope exchange of oxygen with C18O2 in a flow reactor. The phase composition studies show the ability to obtain single-phase materials at certain sintering conditions. Nd/Sm ratio on the surface is close to stoichiometric one, while (Nd + Sm)/Ni ratio on the surface is below stoichiometric. Such materials possess a high oxygen mobility (D⁎ up to ∼10−7 cm2/s at 700 °C). •Nd2-xSmxNiO4+δ, x = 0.2 and 0.4 were sintered in a furnace and by e-beams.•The samples were characterized by XRD, XPS and isotope exchange of oxygen.•One can obtain single-phase materials at certain sintering conditions.•Such materials possessed a high oxygen mobility (D⁎ up to ∼10−7 cm2/s at 700 °C).