Journal
JOURNAL OF POWER SOURCES
Volume 296, Issue -, Pages 318-326Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.07.060
Keywords
LSCF; SDC; Mixing; Infiltration; Dip coating; Solid oxide fuel cell
Funding
- Office of Naval Research [NOR N00014-14-1-0466]
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The incorporation of Sm0.2Ce0.8O2 (SDC) into La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) is carried out by three methods: mechanical mixing, infiltration, and dip coating. The effects of SDC on the electrochemical performance of the LSCF cathodes are studied by electrochemical impedance spectroscopy (EIS) at 800 degrees C for 100 h. LSCF mechanically mixed with SDC as the cathode decreases the electrochemical performance of the half-cell; the LSCF cathode infiltrated with SDC offers faster activation and decreased resistance with thermal treatment time; and the LSCF cathode dip coated with SDC has the smallest polarization resistance. These cathodes also show clear microstructure differences at the cathode/interconnect interface after 100 h of thermal treatment. SrCrO4 phase forms on all the cathodes near the interconnect. Reactions between the mechanically mixed cathode and the YSZ electrolyte destroy the electrolyte. The influence of SDC catalyst on oxygen adsorption, dissociation, and incorporation is explained for each type of cathodes. Overall, dip coating method is recommended for incorporation of SDC into the LSCF cathode. (C) 2015 Elsevier B.V. All rights reserved.
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