Comparison of MnCo2O4 coated Crofer 22 H, 441, 430 as interconnects for intermediate-temperature solid oxide fuel cell stacks

Belma Talic*, Vinothini Venkatachalam, Peter Vang Hendriksen, Ragnar Kiebach

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The low-cost ferritic steel grades 441 and 430 are benchmarked against the specialty grade Crofer 22H as possible interconnect materials for intermediate temperature solid oxide fuel cells. The steels are either pre-oxidized or coated with MnCo2O4. The composition and growth rate of the oxide scales in air is evaluated over a period of 2000 h at 650, 700 and 750 °C. The MnCo2O4 coating is found to reduce the thickness of the oxide scale on all three steels at 700 and 750 °C. The greatest protective effect is achieved on Crofer 22H. A SiO2 scale is formed at the Cr2O3/steel interface after oxidation for all three steels, but it remains discontinuous during the evaluated period. The MnCo2O4 coating provides sufficient protection to make the low-cost steels 441 and 430 promising interconnect materials for operation at 650–700 °C. For higher operation temperatures, 441 is not applicable due to poor scale adhesion.
Original languageEnglish
Article number153229
JournalJournal of Alloys and Compounds
ISSN0925-8388
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Solid oxide cell
  • Interconnect
  • Ferritic stainless steel
  • High temperature corrosion
  • Coating

Cite this

@article{08f998255ba042bbb1ec73cebe295314,
title = "Comparison of MnCo2O4 coated Crofer 22 H, 441, 430 as interconnects for intermediate-temperature solid oxide fuel cell stacks",
abstract = "The low-cost ferritic steel grades 441 and 430 are benchmarked against the specialty grade Crofer 22H as possible interconnect materials for intermediate temperature solid oxide fuel cells. The steels are either pre-oxidized or coated with MnCo2O4. The composition and growth rate of the oxide scales in air is evaluated over a period of 2000 h at 650, 700 and 750 °C. The MnCo2O4 coating is found to reduce the thickness of the oxide scale on all three steels at 700 and 750 °C. The greatest protective effect is achieved on Crofer 22H. A SiO2 scale is formed at the Cr2O3/steel interface after oxidation for all three steels, but it remains discontinuous during the evaluated period. The MnCo2O4 coating provides sufficient protection to make the low-cost steels 441 and 430 promising interconnect materials for operation at 650–700 °C. For higher operation temperatures, 441 is not applicable due to poor scale adhesion.",
keywords = "Solid oxide cell, Interconnect, Ferritic stainless steel, High temperature corrosion, Coating",
author = "Belma Talic and Vinothini Venkatachalam and Hendriksen, {Peter Vang} and Ragnar Kiebach",
year = "2020",
doi = "10.1016/j.jallcom.2019.153229",
language = "English",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier",

}

TY - JOUR

T1 - Comparison of MnCo2O4 coated Crofer 22 H, 441, 430 as interconnects for intermediate-temperature solid oxide fuel cell stacks

AU - Talic, Belma

AU - Venkatachalam, Vinothini

AU - Hendriksen, Peter Vang

AU - Kiebach, Ragnar

PY - 2020

Y1 - 2020

N2 - The low-cost ferritic steel grades 441 and 430 are benchmarked against the specialty grade Crofer 22H as possible interconnect materials for intermediate temperature solid oxide fuel cells. The steels are either pre-oxidized or coated with MnCo2O4. The composition and growth rate of the oxide scales in air is evaluated over a period of 2000 h at 650, 700 and 750 °C. The MnCo2O4 coating is found to reduce the thickness of the oxide scale on all three steels at 700 and 750 °C. The greatest protective effect is achieved on Crofer 22H. A SiO2 scale is formed at the Cr2O3/steel interface after oxidation for all three steels, but it remains discontinuous during the evaluated period. The MnCo2O4 coating provides sufficient protection to make the low-cost steels 441 and 430 promising interconnect materials for operation at 650–700 °C. For higher operation temperatures, 441 is not applicable due to poor scale adhesion.

AB - The low-cost ferritic steel grades 441 and 430 are benchmarked against the specialty grade Crofer 22H as possible interconnect materials for intermediate temperature solid oxide fuel cells. The steels are either pre-oxidized or coated with MnCo2O4. The composition and growth rate of the oxide scales in air is evaluated over a period of 2000 h at 650, 700 and 750 °C. The MnCo2O4 coating is found to reduce the thickness of the oxide scale on all three steels at 700 and 750 °C. The greatest protective effect is achieved on Crofer 22H. A SiO2 scale is formed at the Cr2O3/steel interface after oxidation for all three steels, but it remains discontinuous during the evaluated period. The MnCo2O4 coating provides sufficient protection to make the low-cost steels 441 and 430 promising interconnect materials for operation at 650–700 °C. For higher operation temperatures, 441 is not applicable due to poor scale adhesion.

KW - Solid oxide cell

KW - Interconnect

KW - Ferritic stainless steel

KW - High temperature corrosion

KW - Coating

U2 - 10.1016/j.jallcom.2019.153229

DO - 10.1016/j.jallcom.2019.153229

M3 - Journal article

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 153229

ER -