Sr2NiMoO6-delta as anode material for LaGaO3-based solid oxide fuel cell

The double-perovskite Sr2NiMoO6-delta (SNMO) was investigated as an anode material of a solid oxide fuel cell (SOFC). With a 300 mu m thick La0.9Sr0.1Ga0.8Mg0.2O3-sigma (LSGM) disk as electrolyte and Ba0.5Sr0.5Co0.8Fe0.2O3-delta as the cathode, the SNMO anode showed power densities of 819 mW cm(-2) in hydrogen at 1123 K. Moreover, there was no buffer layer between anode and electrolyte, which would reduce design techniques and save design cost. After test no chemical reaction was discovered between anode and electrolyte. The anode exhibited good conductivity and the value was around 60 S cm(-1) in H-2. Also it had almost linear thermal expansion from room temperature to 1253 K and the average thermal expansion coefficient was about 12.14 x 10(-6) K-1, which was quite close to that of La0.9Sr0.1Ga0.8Mg0.2O3 (12.17 x 10(-6) K-1) electrolyte. (C) 2008 Elsevier B.V. All rights reserved.