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Characterization of Metallic Interconnects Extracted from Solid Oxide Fuel Cell Stacks Operated up to 20,000 h in Real Life Conditions: The Air Side

Author

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  • Giorgia Ghiara

    (Department of Chemistry and Industrial Chemistry (DCCI), University of Genoa, Via Dodecaneso 31, 16146 Genova, Italy)

  • Paolo Piccardo

    (Department of Chemistry and Industrial Chemistry (DCCI), University of Genoa, Via Dodecaneso 31, 16146 Genova, Italy)

  • Valeria Bongiorno

    (Department of Chemistry and Industrial Chemistry (DCCI), University of Genoa, Via Dodecaneso 31, 16146 Genova, Italy)

  • Christian Geipel

    (Sunfire GmbH, Gasanstaltstraße 2, 01237 Dresden, Germany)

  • Roberto Spotorno

    (Department of Chemistry and Industrial Chemistry (DCCI), University of Genoa, Via Dodecaneso 31, 16146 Genova, Italy)

Abstract

Metallic interconnects represent the main component of a solid oxide fuel cell (SOFC) stack in terms of weight and volume. They are typically made of ferritic stainless steel (FSS) coated on the air side. At the stack operating conditions, the interconnect is exposed to a dual atmosphere: air at the cathode side; fuel (a hydrogen-rich mixture) at the anode side. The stacks considered in this study were field operated in reformed natural gas for 5000, 9000 and 20,000 h respectively. The analyzed interconnects are made from CROFER22APU and coated on the air side with Co-Mn base spinel. One interconnect has been studied for each stack by sampling and preparing cross section the inlet and outlet positions. The samples were characterized by SEM-EDXS in order to investigate the evolution of the interconnect at the air side. The interaction between the metal substrate and the coating is investigated highlighting the formation of chromia based thermal grown oxide (at the FSS/coating interface) and the solid-state diffusion of Cr and Fe from the metal into the coating. The microstructural features evolving as a function of time are also quantified.

Suggested Citation

  • Giorgia Ghiara & Paolo Piccardo & Valeria Bongiorno & Christian Geipel & Roberto Spotorno, 2020. "Characterization of Metallic Interconnects Extracted from Solid Oxide Fuel Cell Stacks Operated up to 20,000 h in Real Life Conditions: The Air Side," Energies, MDPI, vol. 13(24), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6487-:d:458707
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    References listed on IDEAS

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    Cited by:

    1. Attilio Converti, 2021. "Environmental and Energetic Valorization of Renewable Resources," Energies, MDPI, vol. 14(24), pages 1-5, December.
    2. Paolo Piccardo & Roberto Spotorno & Christian Geipel, 2022. "Investigation of a Metallic Interconnect Extracted from an SOFC Stack after 40,000 h of Operation," Energies, MDPI, vol. 15(10), pages 1-16, May.
    3. Mao, Jingwen & Wang, Enhua & Wang, Hewu & Ouyang, Minggao & Chen, Youpeng & Hu, Haoran & Lu, Languang & Ren, Dongsheng & Liu, Yadi, 2023. "Progress in metal corrosion mechanism and protective coating technology for interconnect and metal support of solid oxide cells," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).

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