| Reactive element and Cu-doped (Mn, Co)3O4 as a protective coating for SOFC metallic interconnects |
Hyunghoon Song1, Jeongah Lee4, Kyung Taek Bae1, Taehee Lee3, WooChul Jung2,4, Kang Taek Lee1, Joongmyeon Bae1
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1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea
2Research Institute of Advanced Materials, Seoul National University, 1, Gwanak-Ro, Gwanak-Gu, Seoul, 08826, Republic of Korea
3Power Generation and Environment Laboratory, Korea Electric Power Corp. Research Institute, 105, Munji-Ro, Yuseong-Gu, Daejeon, 34056, Republic of Korea
4Department of Materials Science and Engineering, Seoul National University, 1, Gwanak-Ro, Gwanak-Gu, Seoul, 08826, Republic of Korea |
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Received: May 7, 2025; Revised: July 3, 2025 Accepted: July 22, 2025. Published online: August 27, 2025. |
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| ABSTRACT |
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Inhibiting Cr2O3 growth and Cr evaporation from metallic interconnects is essential for the long-term performance stability of solid oxide fuel cell (SOFC) stacks. (Mn,Co)3O4 spinel oxide-based coatings have been considered as the most promising coating material for protective coating of metallic interconnects. In this study, we developed a new composition of (Mn,Co)3O4 spinel oxides with reactive elements and Cu dopants: La0.1Cu0.2Mn1.35Co1.35O4 (LCMC) and Ce0.1Cu0.2Mn1.35Co1.35O4 (CCMC). As a result of partial incorporation of reactive elements into the (Mn,Co)3O4 lattice, the secondary phases containing the reactive element dopants were generated and the resulting reactive element-rich clusters were found in the coating layer. Area specific resistance (ASR) measurements of coated interconnect samples at SOFC operating temperatures showed that the LCMC-coated interconnect sample exhibits exceptional stability at 800 °C (ASR increase of ~ 1 mΩ∙cm2/kh), whereas CCMC, Mn1.5Co1.5O4 (MC), and Cu0.2Mn1.4Co1.4O4 (CMC)-coated interconnect samples exhibited similar degradation behaviors. The post-reaction structural and chemical analyses showed that LCMC can significantly suppress Cr diffusion, compared to CCMC, MC, and CMC-coated interconnect samples. Based on these results, it is concluded that LCMC is a promising candidate for the protective coating of SOFC metallic interconnects. |
| Key words:
Solid oxide fuel cell stack · Metallic interconnect · Spinel oxide coating · Multidoping · Long-term durability |
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