Structural and microstructural characterization and properties of new phases in the Nd-Sr-Co-(Fe/Mn)-O system as air-electrodes in SOFCs
authors Boulahya, K; Gil, DM; Hassan, M; Martin, SG; Amador, U
nationality International
journal DALTON TRANSACTIONS
keywords OXIDE FUEL-CELLS; ELECTRICAL-CONDUCTIVITY; K2NIF4-TYPE STRUCTURE; THERMAL-EXPANSION; CATHODE MATERIALS; OXYGEN REDUCTION; IONIC TRANSPORT; MAGNETORESISTANCE
abstract New oxides of the (NdSr)(n+1)MO3n+1 (M = Co and Mn or Fe) series are reported. Compounds of composition NdSrCo0.75Fe0.25O4.(10), NdSrCo0.75Mn0.25O4.08 and Nd0.5Sr1.5Co0.75Mn0.25O3.86 are the n = 1 members of the Ruddlesden-Popper homologous series (K2NiF4 structural type) as determined by X-ray diffraction and different transmission electron microscopy techniques. Their crystal structure consists of connected (Co-Fe/Mn)O-6 octahedra blocks separated by (Nd/Sr) O rock-salt like layers along the c-axis. Interstitial oxygen atoms or anion vacancies are induced depending on composition. Oxides with interstitial oxygen show good performances as intermediate temperature solid oxide fuel cell (IT-SOFC) cathode. The areaspecific resistance values of electrodes made of these oxides at 973 K in air are 0.18 Omega cm(2) for NdSrCo0.75Fe0.25O4.(10) and NdSrCo0.75Mn0.25O4.08 (comparable to the one of the state-of-the-art materials proposed as cathodes in IT-SOFC), and 1.38 Omega cm(2) for Nd0.5Sr1.5Co0.75Mn0.25O3.86.
publisher ROYAL SOC CHEMISTRY
issn 1477-9226
year published 2017
volume 46
issue 4
beginning page 1283
ending page 1289
digital object identifier (doi) 10.1039/c6dt03970g
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000395373200029
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journal impact factor 4.099
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