Iron doped manganese cobaltite spinel coatings produced by electrophoretic co-deposition on interconnects for solid oxide cells: Microstructural and electrical characterization

E. Zanchi, Sebastian Molin, A.G. Sabato, Belma Talic, G. Cempura, A.R. Boccaccini, F. Smeacetto*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We report a systematic microstructural and electrical characterization of iron doped Mn–Co spinel coatings processed by electrophoretic co-deposition of Mn1.5Co1.5O4 and Fe2O3 powders on Crofer 22 APU and AISI 441 steel substrates. Iron addition to Mn–Co spinel coating leads to a reduction of the area specific resistance on both substrates, after 3200 h at 750 °C. The Fe doped Mn–Co coating both leads to a thinner oxide scale and reduces the sub scale oxidation for the Crofer 22 APU substrate. Fe doped Mn–Co on AISI 441 shows both a thicker oxide scale and low area specific resistance values, likely due to a doping effect of the oxide scale by minor alloying elements. The different mechanisms by which iron doping of Mn–Co spinels can influence elemental interdiffusion at the steel-oxide scale-coating interfaces and relative contributions to the overall area specific resistance are evaluated by means of advanced electron microscopy. The promising results are further confirmed in a cell test, where the Fe doped MnCo coated interconnect does not induce any degradation of the oxygen electrode, proving its efficiency.
Original languageEnglish
Article number227910
JournalJournal of Power Sources
Volume455
Number of pages11
ISSN0378-7753
DOIs
Publication statusPublished - 2020

Keywords

  • Electrophoretic deposition
  • Coating
  • Solid oxide cells
  • Electron microscopy

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