Structural, electrical and electrochemical properties of calcium-doped lanthanum nickelate / Kolchugin A. A.,Pikalova E. Yu.,Bogdanovich N. M.,Bronin D. I.,Pikalov S. M.,Plaksin S. V.,Ananyev M. V.,Eremin V. A. // SOLID STATE IONICS. - 2016. - V. 288, l. SI. - P. 48-53.

ISSN/EISSN:

0167-2738 / 1872-7689

Type:

Article; Proceedings Paper

Abstract:

The present work focuses on the structural, thermo-mechanical and electrical properties of La2-xCaxNiO4 + (delta) with different calcium content (x = 0-0.4) and the electrochemical performance of the electrodes on their base in contact with a Ce0.8Sm0.2O1.9 electrolyte. It was shown that the introduction of even a small amount of calcium (x = 0.1) stabilized the crystal structure in the tetragonal syngony across the whole temperature range 25-800 degrees C. Dilatometric study of the compact samples in the entire concentration range of Ca showed no phase transitions up to 800 degrees C The total electrical conductivity, measured by a dc four-probe technique, increased with an increase in calcium content. However, electrochemical activity of the La2-xCaxNiO4 + delta - based electrodes, contrarily, drastically decreased. The polarization resistance R-eta, derived from the impedance spectroscopy data, increased from 0.18 Omega.cm(2) (x = 0) to 1.240 Omega.cm(2) (x = 0.3) at 800 degrees C. The coefficients of oxygen surface exchange (k{*}) and oxygen tracer diffusion (D{*}) calculated from the oxygen isotope exchange data for La2NiO4+delta were considerably higher than those for La1.7Ca0.3NiO4+delta (4.54-10(-7) cm.s(-1) and 3.02.10(-8) cm(2).s(-1) (x = 0); 2.91-10(-8) cm.s(-1) and 5.82.10(-10) cm(2).s(-1) (x = 0.3) at 800 degrees C, respectively). It was found that for La1.7Ca0.3NiO4+delta the rate-determining stage of oxygen surface exchange is incorporation of oxygen, while for La2NiO4+delta it is oxygen dissociative adsorption. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

SOFC; Cathode; Lanthanum Nickelate; Ca-doping; Polarization Resistance; Oxygen Isotope Exchange OXIDE FUEL-CELLS; MIXED CONDUCTING OXIDES; OXYGEN NONSTOICHIOMETRY; SURFACE EXCHANGE; TRANSPORT-PROPERTIES; LATTICE STRUCTURE; CATHODE MATERIAL; DIFFUSION; KINETICS; LA2NIO4+DELTA

DOI:

10.1016/j.ssi.2016.01.035

Web of Science ID:

ISI:000376710900011

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Note	20th International Conference on Solid State Ionics (SSI), Keystone, CO, JUN 14-19, 2015
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1872-7689
Keywords-Plus	OXIDE FUEL-CELLS; MIXED CONDUCTING OXIDES; OXYGEN NONSTOICHIOMETRY; SURFACE EXCHANGE; TRANSPORT-PROPERTIES; LATTICE STRUCTURE; CATHODE MATERIAL; DIFFUSION; KINETICS; LA2NIO4+DELTA
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Condensed Matter
Author-Email	laba50@mail.ru
ResearcherID-Numbers	Ananyev, Maxim/F-5104-2014
ORCID-Numbers	Ananyev, Maxim/0000-0002-2254-0193 Pikalova, Elena/0000-0001-8176-9417
Number-of-Cited-References	39
Usage-Count-Last-180-days	5
Usage-Count-Since-2013	27
Journal-ISO	Solid State Ion.
Doc-Delivery-Number	DM9UJ