(La,Sr)(Fe,Co)O-3-based cathode contact materials for intermediate-temperature solid oxide fuel cells
authors Naumouich, EN; Zakharchuk, K; Obrebowski, S; Yaremchenko, A
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords SOFC; Interconnect; Area-specific resistance; Cathode contact material; Crofer 22 APU; Chromium barrier
keywords ELECTROCHEMICAL PERFORMANCE; (LA,SR)(CO,FE)O-3 CATHODES; METALLIC INTERCONNECT; CHROMIUM DEPOSITION; SPINEL COATINGS; PEROVSKITES; LAYERS; LANI0.6FE0.4O3; EXPANSION; ENERGY
abstract Development of the cathode contact materials (CCMs) for intermediate-temperature solid oxide fuel cells (IT-SOFCs) is a relatively new task promoted by the appearance of full-sized cells, which may operate below 700 degrees C with sufficient performance, on the market. CCM must ensure a low-resistive interface between interconnect and cathode and is supposed to be sintered at temperatures below 800 degrees C, as imposed by the specifications of IT-SOFCs and corresponding sealants. The present work is focused on the elaboration of CCMs derived from perovskite-like La0.6Sr0.4Co0.2Fe0.8O3-delta employing two approaches: introduction of the A-site cation vacancies and partial substitution by copper in B sublattice. Both approaches were found to result in a higher electrical conductivity below 800 degrees C if compared to the parent material. All studied materials exhibit acceptable coefficients of thermal expansion, 13.5-14.8 ppm K-1 at 25-700 degrees C. Area-specific resistance (ASR) of CCM/chromium barrier (Mn1.5Co1.5O4)/interconnect (Crofer 22APU) assemblies prepared by the screen-printing was measured in air at 660-750 degrees C. The studies revealed that morphology of CCM powder should be considered as a key parameter in the formation of interfaces with a low resistivity. The best ASR values, below 4 m Omega cm(2) at 660-700 degrees C, were obtained for La0.6Sr0.4Co0.15Cu0.10Fe0.75O3-delta, La0.6Sr0.4Co0.15Cu0.05Fe0.80O3-delta and (La0.60Sr0.40)(0.995)Co-0.20 Fe0.80O3-delta as CCMs. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2017
volume 42
issue 49
beginning page 29443
ending page 29453
digital object identifier (doi) 10.1016/j.ijhydene.2017.09.122
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000418317100036
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journal impact factor 4.229
5 year journal impact factor 4.064
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