Oxidation behavior of a Ni-Fe support in SOFC anode atmosphere

Na Xu, Ming Chen*, Minfang Han

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In this work, we investigated the long-term oxidation behavior of a Ni-Fe (1:1 weight ratio) support for solid oxide fuel cell (SOFC) applications. Ni-Fe supports were obtained through tape casting, high temperature sintering and pre-reducing in 97% H2/N2 (9/91)-3% H2O at 750 and 1000 °C, respectively. Then the Ni-Fe supports were exposed in simulated anode atmospheres of 97% H2/N2 (9/91)-3% H2O and 75% H2/N2 (9/91)-25% H2O for periods of up to 1000 h at 750 °C. The samples were examined for mass change, phase and chemical composition, and microstructure evolution during the annealing process. The Ni-Fe supports exposed to H2/N2-3% H2O showed negligible oxidation, while those exposed to H2/N2-25% H2O showed a 4–6% mass increase, due to the fact that a Fe-rich oxide scale was found on the surface of the Ni-Fe alloy particles. Room-temperature conductivity measurements showed that the supports annealed in the two atmospheres maintained sufficiently high conductivity. The results from the current work demonstrate that the porous Ni-Fe support can be well employed in SOFCs, especially metal-supported SOFCs.
Original languageEnglish
JournalJournal of Alloys and Compounds
Volume765
Pages (from-to)757-763
ISSN0925-8388
DOIs
Publication statusPublished - 2018

Keywords

  • Ni-Fe support
  • Oxidation resistance
  • Metal-supported solid oxide fuel cell
  • Electrical conductivity

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