Cathodes based on rare-earth metal nickelate ferrites prepared from industrial raw materials for solid oxide fuel cells / Yaroslavtsev I. Yu.,Bogdanovich N. M.,Vdovin G. K.,Dem'yanenko T. A.,Bronin D. I.,Isupova L. A. // RUSSIAN JOURNAL OF ELECTROCHEMISTRY. - 2014. - V. 50, l. 6. - P. 548-553.

ISSN/EISSN:

1023-1935 / 1608-3342

Type:

Article

Abstract:

Powders of composite materials based on lanthanum nickelate-ferrite with different contents of lanthanides were synthesized using Ln-Ni-Fe-O (LnNF) mischmetal. The phase composition of the powders was determined by XRD. The crystal structure of the main phase in LnNF obtained using a mischmetal with a high lanthanum content is perovskite-like, while the structure with a high cerium content is fluorite-like. The temperature coefficients of linear expansion of the synthesized materials were determined by dilatometry. The temperature dependences of electric conductivity of the compact samples and porous electrodes from these materials were studied by the DC four-probe method. The electric conductivity of compact samples from materials prepared using the mischmetal with the perovskite-like structure of the main phase exceeds the electric conductivity of the materials based on the mischmetal with a high cerium content by approximately three orders of magnitude. The temperature dependences of polarization conductivity of electrodes in cells with the Ce0.8Sm0.2O1.9 (SDC) electrolyte at 600-900A degrees C in air were studied by impedance spectroscopy. The LnNF electrodes with a perovskite-like crystal structure of the main phase showed high electrochemical activity.

Author keywords:

lanthanum nickelate-ferrite; mischmetal; composite cathode; electric resistance; electrochemical activity LANI(FE)O-3; ELECTRODES

DOI:

10.1134/S1023193514060123

Web of Science ID:

ISI:000337800000007

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1608-3342
Keywords-Plus	LANI(FE)O-3; ELECTRODES
Research-Areas	Electrochemistry
Web-of-Science-Categories	Electrochemistry
Author-Email	bronin@ihte.uran.ru
ResearcherID-Numbers	Isupova, Lyubov/E-9273-2012
Funding-Acknowledgement	Ural Branch, Russian Academy of Sciences {[}12-C-3-1016]
Funding-Text	This study was financially supported under the Program of Fundamental Research of the Ural Branch, Russian Academy of Sciences (grant no. 12-C-3-1016, 2012).
Number-of-Cited-References	11
Usage-Count-Since-2013	19
Journal-ISO	Russ. J. Electrochem.
Doc-Delivery-Number	AJ6JS