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Title: Oxygen-deficient Nd0.8Sr1.2Ni0.8M0.2O4-δ (M = Ni, Co, Fe) nickelates as oxygen electrode materials for SOFC/SOEC
Author: Arias-Serrano, Blanca I.
Kravchenko, Ekaterina
Zakharchuk, Kiryl
Grins, Jekabs
Svensson, Gunnar
Pankov, Vladimir
Yaremchenko, Aleksey
Issue Date: 2019
Publisher: Electrochemical Society
Abstract: Ruddlesden-Popper Nd0.8Sr1.2Ni0.8M0.2O4-δ (M = Ni, Co, Fe) nickelates have been characterized as prospective oxygen electrode materials for solid electrolyte cells. XRD studies showed that these oxides retain tetragonal K2NiF4-type structure in air until at least 900°C. Average thermal expansion coefficients of Nd0.8Sr1.2Ni0.8M0.2O4-δ calculated from the structural data are in the range 14.5-15.8 ppm/K. TGA studies revealed that these nickelates are oxygen-deficient in air at temperature above 700°C but tends to oxygen stoichiometry or minor excess on cooling. Incorporation of cobalt or iron into nickel sublattice of Nd0.8Sr1.2NiO4-δ reduces oxygen deficiency and electrical conductivity. Electrochemical impedance spectroscopy studies of symmetrical cells showed that porous Nd0.8Sr1.2Ni0.8M0.2O4-δ electrodes applied onto Ce0.9Gd0.1O2-δ electrolyte exhibit quite similar performance, with lowest values of polarization resistance (0.8 Ω⸱cm2 at 800°C) observed for M = Ni. The polarization resistance can be further decreased (down to 0.04 Ω⸱cm2 at 800°C for M = Ni) by surface modification with PrOx.
Peer review: yes
DOI: 10.1149/09101.2387ecst
ISSN: 1938-5862
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