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<p>Inhibiting Cr<sub>2</sub>O<sub>3</sub> growth and Cr evaporation from metallic interconnects is essential for the long-term performance stability of solid oxide fuel cell (SOFC) stacks. (Mn,Co)<sub>3</sub>O<sub>4</sub> 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)<sub>3</sub>O<sub>4</sub> spinel oxides with reactive elements and Cu dopants: La<sub>0.1</sub>Cu<sub>0.2</sub>Mn<sub>1.35</sub>Co<sub>1.35</sub>O<sub>4</sub> (LCMC) and Ce<sub>0.1</sub>Cu<sub>0.2</sub>Mn<sub>1.35</sub>Co<sub>1.35</sub>O<sub>4</sub> (CCMC). As a result of partial incorporation of reactive elements into the (Mn,Co)<sub>3</sub>O<sub>4</sub> 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&#xa0;°C (ASR increase of ~ 1 mΩ∙cm<sup>2</sup>/kh), whereas CCMC, Mn<sub>1.5</sub>Co<sub>1.5</sub>O<sub>4</sub> (MC), and Cu<sub>0.2</sub>Mn<sub>1.4</sub>Co<sub>1.4</sub>O<sub>4</sub> (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.</p>

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Reactive element and Cu-doped (Mn, Co)3O4 as a protective coating for SOFC metallic interconnects

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月27日

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  • Hyunghoon Song,
  • Jeongah Lee,
  • Kyung Taek Bae,
  • Taehee Lee,
  • WooChul Jung,
  • Kang Taek Lee,
  • Joongmyeon Bae

摘要

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.