Microwave synthesis & sintering of Sm and Ca co-doped ceria ceramics
authors Prado-Gonjal, J; Heuguet, R; Munoz-Gil, D; Rivera-Calzada, A; Marinel, S; Moran, E; Schmidt, R
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords IT-SOFC; Electrolyte; Ceria; Oxygen ion conductivity
keywords OXIDE FUEL-CELLS; YTTRIA-STABILIZED ZIRCONIA; IONIC-CONDUCTIVITY; ELECTRICAL-PROPERTIES; COMPOSITE ELECTROLYTES; SR2+; HETEROSTRUCTURES; PERFORMANCE; IMPROVEMENT; RELAXATION
abstract In this work we report on the combined use of microwave (MW) heating sources for the powder synthesis and the ceramic sintering of Sm and Ca co-doped ceria Ce0.8Sm0.18Ca0.02O1.9 polycrystalline materials for potential application as an electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs). We investigate the crystal structure, ceramic microstructure and the oxygen ion conductivity in detail and compare the latter to conventionally sintered ceramics. MW sintering of ceramic pellets leads to only slightly increased resistivity as compared to conventional sintering, but offers massive energy and time savings for potential industrial production processes. Exceptionally high oxygen ion conductivity without any significant electronic contribution was found in MW synthesized and MW sintered pellets, where the total resistivity, composed of grain boundary and bulk contributions, was found to be in the range of 0.5-1 ka at 500 degrees C. Sm- and Ca co-doped ceria may be well-suited for electrolyte materials in IT-SOFCs. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2015
volume 40
issue 45
beginning page 15640
ending page 15651
digital object identifier (doi) 10.1016/j.ijhydene.2015.07.161
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000365367200029
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