Article Entropy-engineered spinel oxide coatings to enhance oxidation resistance and electrical performance of solid oxide fuel cell interconnectors

Cheng-Ju Tsai ; Hideyuki Murakami ; Yoshiaki Toda SAMURAI ORCID ; Fan-Yi Ouyang ORCID ; Hyoung Seop Kim ORCID ; An-Chou Yeh ORCID

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Cheng-Ju Tsai, Hideyuki Murakami, Yoshiaki Toda, Fan-Yi Ouyang, Hyoung Seop Kim, An-Chou Yeh. Entropy-engineered spinel oxide coatings to enhance oxidation resistance and electrical performance of solid oxide fuel cell interconnectors. Applied Surface Science Advances. 2026, 32 (), 100956. https://doi.org/10.1016/j.apsadv.2026.100956

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(abstract)

This study investigates spinel oxide coatings derived from medium- to high-entropy alloy systems for solid oxide fuel cell interconnect applications. Alloy coatings of Fe-Mn-Co, Fe-Mn-Co-Cu, and Fe-Mn-Co-Cu-Ni are deposited on SUS430 stainless steel substrates utilizing a magnetron sputtering system and subjected to isothermal oxidation at 650 °C. Microstructural and phase analyses reveal the anomalous formation of hematite layers and Cr-Fe mixed oxide structures in Fe-Mn-Co and Fe-Mn-Co-Cu coatings, which indicates greater Fe diffusion at the substrate/coating interface during the early stage of oxidation comparing to that of Fe-Mn-Co-Cu-Ni coating. Theoretical calculations confirm that the hematite and Cr-Fe oxides significantly increase the area specific resistance of Fe-Mn-Co and Fe-Mn-Co-Cu coated steels at 650 °C. Notably, the Fe-Mn-Co-Cu-Ni coating can exhibit superior electrical conductivity, and resistances to oxidation and Cr-evaporation. This study demonstrates that entropy-engineered composition can promote the formation of single phase spinel, enhance phase stability, and can potentially be beneficial for long-term performance of solid oxide fuel cell as coating material for interconnects.

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Keyword: Solid oxide fuel cell, High-entropy alloy, Spinel coating, Area specific resistance, Cr-evaporation

Date published: 2026-02-27

Publisher: Elsevier BV

Journal:

  • Applied Surface Science Advances (ISSN: 26665239) vol. 32 100956

Funding:

  • Executive Yuan Republic of China Ministry of Education
  • National Science and Technology Council NSTC 114-2221-E-007-085-MY3

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1016/j.apsadv.2026.100956

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Updated at: 2026-04-05 13:43:35 +0900

Published on MDR: 2026-04-06 12:26:13 +0900

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