Abstract
(Mn,Cu)3O4-based conductive oxides are examined as protective coatings to improve the surface stability of metallic interconnects for solid oxide fuel cells at high temperatures. Nano-sized Mn3 − x Cu x O4 materials with various Cu contents (x = 1.0–1.5) are synthesized and a composition-structure–property relationship is experimentally determined. The Cu content (x) has a significant influence on phase stability as well as sintering, electrical, and thermal expansion characteristics. Thin and dense Mn3 − x Cu x O4 coatings are fabricated on the interconnects (Crofer 22 APU) by a slurry coating process and subsequent heat treatment. The coated interconnects exhibit area-specific resistances as low as 7.1–15.0 mΩ cm2 at 800 °C. The electrochemical cell shows no performance degradation in the presence of the Mn3 − x Cu x O4-coated interconnect. The results indicate that the Mn3 − x Cu x O4 coatings act as an effective barrier to high-temperature oxidation of the metallic interconnects.
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Acknowledgements
This work was supported by the Materials Technology Development Program (Development of Highly Conductive Nanocomposite Materials for Interconnects, project no. 10037312), which was funded by the Ministry of Knowledge Economy (MKE, Korea).
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Submitted as a research paper to a special issue of Journal of Solid State Electrochemistry on “Electrochemistry of Cathodic and Anodic Controlled Corrosion”
This paper is dedicated to Professor Su-Il Pyun, who has advanced interfacial electrochemistry in the field of corrosion and materials science, on the occasion of his 72nd birthday.
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Waluyo, N.S., Park, BK., Lee, SB. et al. (Mn,Cu)3O4-based conductive coatings as effective barriers to high-temperature oxidation of metallic interconnects for solid oxide fuel cells. J Solid State Electrochem 18, 445–452 (2014). https://doi.org/10.1007/s10008-013-2245-6
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DOI: https://doi.org/10.1007/s10008-013-2245-6