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.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)