Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Sebastian Molin, P. Jasinski, Lars Mikkelsen, W. Zhang, Ming Chen, Peter Vang Hendriksen

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Abstract

In this study two materials, MnCo2O4 and MnCo1.8Fe0.2O4 are studied as potential protective coatings for Solid Oxide Fuel Cell interconnects working at 750 °C. First powder fabrication by a modified Pechini method is described followed by a description of the coating procedure. The protective action of the coating applied on Crofer 22 APU is evaluated by following the area specific resistance (ASR) of the scale/coating for 5500 h including several thermal cycles. The coating is prepared by brush painting and has a porous structure after deposition. Post mortem microstructural characterization performed on the coated samples shows good protection against chromium diffusion from the chromia scale ensured by a formation of a dense reaction layer. This study shows, that even without high temperature sintering and/or reactive sintering it is possible to fabricate protective coatings based on MnCo spinels.
Original languageEnglish
JournalJournal of Power Sources
Volume336
Pages (from-to)408-418
Number of pages11
ISSN0378-7753
DOIs
Publication statusPublished - 2016

Keywords

  • Protective coating
  • High temperature corrosion
  • Solid oxide fuel cell
  • Interconnect
  • Spinel
  • Electrical conductivity

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