Insight into the synthesis and electrical properties of alkali-earth-substituted Gd3GaO6 oxide-ion and proton conductors / Iakovleva Anastasia,Chesnaud Anthony,Animitsa Irina,Dezanneau Guilhem // INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. - 2016. - V. 41, l. 33. - P. 14941-14951.

ISSN/EISSN:

0360-3199 / 1879-3487

Type:

Article

Abstract:

Novel ionic conductors were prepared by substituting Ca2+ and Sr2+ for Gd3+ in Gd3GaO6. A microwave-assisted combustion technique was used to synthesize these compounds at 900 degrees C. SEM observations showed that both substituents promote grain growth during sintering. XRD proved that the Gd3-x(Ca,Sr)(x)GaO6-x/2 solid solutions are formed up to x = 0.10. Below 600 degrees C, the level of conductivity under wet Ar is higher than that of measured under dry atmospheres, thereby demonstrating the contribution of proton defects to the overall conductivity. The highest level of proton conduction, i.e. sigma(600 degrees C) = 1 x 10(-3) S cm(-1), was measured for Gd2.9Sr0.1GaO5.95 at 600 degrees C in wet Ar. At higher temperatures, only oxygen ions contribute to the conductivity. At 800 degrees C, a total oxide-ion conductivity of sigma(800 degrees C) =1 x 10(-2) S cm(-1) was measured for the highest substitution level, i.e. x = 0.10. In both temperature ranges, activation energy associated with ionic transport decreases with the Me content as a result of an increase in grain size. Stability tests were successfully achieved as the structure of materials remains unchanged after different treatment under severe conditions. Conductivity measurements under varying oxygen partial pressures demonstrated that materials are purely oxide-ion conductors up to pO(2) = 1 x 10(-5) atm. At higher pO(2), a p-type contribution appears. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Author keywords:

New conductors; SOFC; PCFC; Electrolytes; Stability tests; Mixed conduction FUEL-CELLS; RARE-EARTH; TETRAHEDRAL MOIETIES; MECHANISMS; STABILITY; LA1-XBA1+XGAO4-X/2; NONSTOICHIOMETRY; MICROSTRUCTURE; CONDUCTIVITY; ATMOSPHERES

DOI:

10.1016/j.ijhydene.2016.06.090

Web of Science ID:

ISI:000381844300045

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP 7
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Language	English
EISSN	1879-3487
Keywords-Plus	FUEL-CELLS; RARE-EARTH; TETRAHEDRAL MOIETIES; MECHANISMS; STABILITY; LA1-XBA1+XGAO4-X/2; NONSTOICHIOMETRY; MICROSTRUCTURE; CONDUCTIVITY; ATMOSPHERES
Research-Areas	Chemistry; Electrochemistry; Energy \& Fuels
Web-of-Science-Categories	Chemistry, Physical; Electrochemistry; Energy \& Fuels
Author-Email	anastasia.iakovleva@ecp.fr anthony.chesnaud@mines-paristech.fr irina.animitsa@urfu.ru guilhem.dezanneau@ecp.fr
ORCID-Numbers	Dezanneau, guilhem/0000-0003-1937-0581
Funding-Acknowledgement	French Ministry of Higher Education and Research
Funding-Text	This work was financially supported by the Grant of French Ministry of Higher Education and Research and was achieved as part of a collaboration between CentraleSupelec and Mines ParisTech.
Number-of-Cited-References	48
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	15
Journal-ISO	Int. J. Hydrog. Energy
Doc-Delivery-Number	DT9TD