4.3 Article

(Mn,Cu)3O4-based conductive coatings as effective barriers to high-temperature oxidation of metallic interconnects for solid oxide fuel cells

Journal

JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 18, Issue 2, Pages 445-452

Publisher

SPRINGER
DOI: 10.1007/s10008-013-2245-6

Keywords

Solid oxide fuel cell; Metallic interconnect; High-temperature oxidation; Protective coating; Spinel oxide

Funding

  1. Materials Technology Development Program [10037312]
  2. Ministry of Knowledge Economy (MKE, Korea)
  3. Korea Evaluation Institute of Industrial Technology (KEIT) [10037312] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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(Mn,Cu)(3)O-4-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 -aEuro parts per thousand x Cu (x) O-4 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 -aEuro parts per thousand x Cu (x) O-4 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 m Omega cm(2) at 800 A degrees C. The electrochemical cell shows no performance degradation in the presence of the Mn3 -aEuro parts per thousand x Cu (x) O-4-coated interconnect. The results indicate that the Mn3 -aEuro parts per thousand x Cu (x) O-4 coatings act as an effective barrier to high-temperature oxidation of the metallic interconnects.

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