Investigation into the effect of Fe-site substitution on the performance of Sr2Fe1.5Mo0.5O6-δ anodes for SOFCs

Jie Feng*, Guoquan Yang, Ningning Dai, Zhenhua Wang, Wang Sun, David Rooney, Jinshuo Qiao, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Ni-substituted Sr2Fe1.5-xNixMo0.5O6-δ (SFNM) materials have been investigated as anode catalysts for intermediate temperature solid oxide fuel cells. Reduced samples (x = 0.05 and 0.1) maintained the initial perovskite structure after reduction in H2, while metallic nickel particles were detected on the grain surface for x = 0.2 and 0.3 using transmission electron microscopy. Temperature programmed reduction results indicate that the stable temperature for SFNM samples under reduction conditions decreases with Ni content. In addition, X-ray photoelectron spectroscopy analysis suggests that the incorporation of Ni affects the conductivity of SFNM through changing the ratios of Fe3+/Fe2+ and Mo6+/Mo5+. Sr2Fe1.4Ni0.1Mo0.5O6-δ shows the highest electrical conductivity of 20.6 S cm-1 at 800 °C in H2. The performance of this anode was further tested with electrolyte-supported cells, giving 380 mW cm-2 at 750 °C in H2, hence demonstrating that Ni doping in the B-site is beneficial for Sr2Fe1.5Mo0.5O6-δ anode performance. 

Original languageEnglish
Pages (from-to)17628-17634
Number of pages7
JournalJournal of Materials Chemistry A
Volume2
Issue number41
Early online date02 Sep 2014
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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