(La,Sr)(Fe,Co)O-3-based cathode contact materials for intermediate-temperature solid oxide fuel cells


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.



subject category

Chemistry; Electrochemistry; Energy & Fuels


Naumouich, EN; Zakharchuk, K; Obrebowski, S; Yaremchenko, A

our authors


E.N. Naumovich and S. Obrqbowski would like to acknowledge financial support from the Polish Ministry of Higher Education and Science statutory program, grant no. CPC/4/STAT/2016. K. Zakharchuk and A. Yaremchenko would like to acknowledge financial support from the FCT, Portugal (project IF/01072/2013/CP1162/CT0001 and project CICECO - Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (FCT ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement).

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