The double perovskite Sr2CoMoO6-delta was investigated as a candidate anode for a solid oxide fuel cell (SOFC) Thermogravimetric analysis (TGA) and powder X-ray diffraction (XRD) showed that the canon array is retained to 800 degrees C in H-2 atmosphere with the introduction of a limited concentration of oxide-ion vacancies Stoichiometric Sr2CoMoO6 has an antiferromagnetic Neel temperature T-N approximate to 37 K but after reduction in H-2 at 800 C fort h long-range magnetic order appears to set in above 300K In H-2 the electronic conductivity increases sharply with temperature in the interval 400 C < T < 500 C due to the onset of a loss of oxygen to make Sr2CoMoO6-delta a good mixed oxide-ion/electronic conductor (MIEC) With a 300-mu m-thick La0 8Sr0 12Ga0 83MB017O2 (815()LSGM) as oxide-ion electrolyte and SrCo08Fe02O3-delta as the cathode the Sr2CoMoO6-delta anode gave a maximum power density of 1017 mWcm(-2) in H-2 and 634 mW cm(-2) in wet CH4 A degradation of power in CH4 was observed which could be attributed to coke build up observed by energy dispersive spectroscopy (EDS) (C) 2010 Elsevier B V All rights reserved