Composite of calcium cobaltite with praseodymium-doped ceria: A promising new oxygen electrode for solid oxide cells
authors Araujo, AJM; Loureiro, FJA; Holz, LIV; Grilo, JPF; Macedo, DA; Paskocimas, CA; Fagg, DP
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords SOFC/SOEC; LSCF; Calcium cobaltite; Microstructure; Electrochemical properties; Gerischer
keywords MISFIT-LAYERED COBALTITE; ELECTROCHEMICAL PERFORMANCE; THERMAL-EXPANSION; RELAXATION-TIMES; LA0.6SR0.4CO0.2FE0.8O3-DELTA CATHODES; HYDROTHERMAL SYNTHESIS; TRANSPORT-PROPERTIES; MODULATED STRUCTURE; MIXED CONDUCTIVITY; REDUCTION REACTION
abstract Calcium cobaltites have emerged as an attractive alternative to be used in Solid Oxide Cells (SOCs), due to their excellent thermal compatibility with standard electrolytes that may privilege these compounds among state-of-the-art SOC electrodes. Nonetheless, their electrochemical performances have been strongly limited by poor oxygen ion transport. Hence, we report a new composite electrode containing the misfit calcium cobaltite [Ca2CoO3-delta](0.62)[CoO2] (C349) phase combined with Ce0.8Pr0.2O2-delta (CPO). A comparative study is presented between this composite and the standard La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF), in terms of their microstructures, number of depositions, and resultant electrochemical properties. Such tailoring permits the best C349/CPO composite electrode to attain high levels of electrochemical performance that rival with the standard LSCF material. This successful result is highly relevant, as it can provide insight into the most critical optimisation factors for similar SOC electrodes that intrinsically suffer from similarly low levels of ionic transport. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
isbn 1879-3487
year published 2021
volume 46
issue 55
beginning page 28258
ending page 28269
digital object identifier (doi) 10.1016/j.ijhydene.2021.06.049
web of science category 12
subject category Chemistry, Physical; Electrochemistry; Energy & Fuels
unique article identifier WOS:000679247700007
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journal impact factor 4.939
5 year journal impact factor 4.469
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