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http://hdl.handle.net/10773/29080
Título: | Oxygen-deficient Nd0.8Sr1.2Ni0.8M0.2O4-δ (M = Ni, Co, Fe) nickelates as oxygen electrode materials for SOFC/SOEC |
Autor: | Arias-Serrano, Blanca I. Kravchenko, Ekaterina Zakharchuk, Kiryl Grins, Jekabs Svensson, Gunnar Pankov, Vladimir Yaremchenko, Aleksey |
Data: | 2019 |
Editora: | Electrochemical Society |
Resumo: | 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 |
URI: | http://hdl.handle.net/10773/29080 |
DOI: | 10.1149/09101.2387ecst |
ISSN: | 1938-5862 |
Aparece nas coleções: | CICECO - Artigos DEMaC - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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ECSTrans_91_(2019)_2387.pdf | 1.24 MB | Adobe PDF | Ver/Abrir |
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