Ceramic-based anode materials for improved redox cycling of solid oxide fuel cells

  • Fu Q
  • Tietz F
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Abstract

In order to improve the reliability of anode-supported solid oxide fuel cells (SOFCs) in terms of tolerance to redox cycles, and to minimise fuel preprocessing for the direct use of readily available hydrocarbons in SOFCs, alternative ceramic-based anode substrate materials and functional anode materials were investigated, with the emphasis on perovskite oxides. Compared to (Sr,La)TiO(3-delta) and Nb(2)TiO(7-delta), (Sr,Y)TiO(3-delta) ceramics (SYT, with a Y content of about 7 at.-%) reduced at high temperatures are promising redox-stable anode substrate materials due to their very small dimensional change upon redox cycling (0.14%). Correspondingly, the composite ceramic SYT/YSZ impregnated with similar to 5 vol.-% Ni has a good chance of being applied as a redox-stable functional anode material due to its even smaller dimensional change upon redox cycling (

Author-supplied keywords

  • Anode
  • Chemical expansion
  • Electrical conductivity
  • Perovskite
  • Redox stability
  • Thermal expansion

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