Double perovskites Sr2Ni1-xMgxMoO6 (x = 0, 0.25) were studied as anode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs) with the La0.88Sr0.12Ga0.82Mg0.18O3-delta (LSGM) electrolyte. XRD results revealed that Sr2Ni0.75Mg0.25MoO6 (SNMM) was chemically compatible with the LSGM electrolyte at the fabrication and operation conditions while a significant amount of impurity phases was observed for the Sr2NiMoO6 (SNM)/LSGM mixture. SOFCs based on the LSGM electrolyte with the SNM and SNMM double perovskites as anode materials and lanthanum cobaltite La0.7Sr0.3Co0:9Fe0.1O3-delta (LSCF) as a cathode material were manufactured. The Ce0.8Sm0.2-delta (SDC) interlayer was used between the LSCF cathode and LSGM compared to the previously published studies where similar interlayers were introduced between the Sr(2)AMoO(6) anode and the LSGM electrolyte. The developed SOFCs were tested using humidified hydrogen as a fuel and ambient air as an oxidant. The electrochemical performance of the cell was studied, using current-voltage curves. The maximum power densities were 61 and 429 mW cm(-2) at 800 degrees C for the LSCF/SDC/LSGM/SNM and LSCF/SDC/LSGM/SNMM single cells, respectively. The LSCF/SDC/LSGM/SNMM cell performance has no apparent degradation at 800 degrees C during 456 h.