A Ce/Ru codoped SrFeO3−δ perovskite for a coke-resistant anode of a symmetrical solid oxide fuel cell

Bangxin Li, Shuai He, Jibiao Li, Xiangling Yue, John T.S. Irvine, Deti Xie, Jiupai Ni*, Chengsheng Ni*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)
13 Downloads (Pure)

Abstract

Employment of identical oxides for the cathode and anode in a symmetrical solid oxide fuel cell (SSOFC) is beneficial for decreasing the fabrication costs of a robust cell. Ce doping on the A site of SrFeO3 increased the structural stability in a reducing atmosphere, but ceria was found to exsolve from the perovskite during the cooling process in the air if the doping level reached 20 atom %. The additional doping of 5 atom % Ru in Sr0.8Ce0.2FeO3 on the Fe site could prevent the ceria segregation in air and induce the surface decomposition under fuel conditions for the formation of nanoscale SrO, CeO2, and Ru0. The SSOFC with Ce/Ru codoped SrFeO3 on a Sr- and Mg-doped LaGaO3 electrolyte showed a small Rp value (0.12 Ω cm2) when H2 and ambient air were used as fuel and oxidant, respectively. The peak power densities of 846 and 310 mW cm–2 were achieved at 800°C using H2 and C3H8 as fuel, respectively. The excellent coke resistance of the anode could be related to the simultaneous in situ exsolution of CeO2, SrO, and Ru0 nanoparticles.
Original languageEnglish
Pages (from-to)14398-14409
Number of pages12
JournalACS Catalysis
Volume10
Issue number24
Early online date24 Nov 2020
DOIs
Publication statusPublished - 18 Dec 2020

Keywords

  • Ceria
  • Propane
  • Coke resistance
  • Metal exsolution
  • Oxide anode
  • Carbonaceous fuel
  • Catalysis
  • Solid oxide fuel cell (SOFC)

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