Ceria-based materials are prospective electrolytes for low and intermediate temperature solid oxide fuel cells. In the present work, fully dense CeO 2 ceramics doped with 10 mol% gadolinium (Gd 0.1 Ce 0.9 O 1.95 ) were prepared with a sol–gel method and commercially purchased GDC 10 electrolyte powders were processed. Particle sizes of synthesized electrolyte powders were minimized by ball-milling method. Grinding of the samples were performed in different times intervals (12 h, 15 h, 18 h, 20 h, 25 h, 30 h, 35 h, 40 h and 45 h). Then, these powders were prepared to obtain of solid oxide fuel cells (SOFCs). Performances of these cells having an active area of 1 cm 2 were tested using a fuel cell test station that measured in different temperatures (650 and 700 °C). In the present study, gadolinium doped ceria (GDC 10 ) synthesiszed powders were investigated by using XRD and SEM images. Performance values of synthesized GDC 10 's in different temperature were compared to by commercial GDC 10 . Commercial GDC 10 's performance at 650 °C were tested, and maximum current density of 0.413 W/cm 2 and maximum current density of 0.949 A/cm 2 were obtained. Commercial GDC 10 at 650 °C has better result. However, synthesized GDC 10 's performance at 700 °C demonstrated better results than commercial GDC 10 's. The performance tests of samples which are 20 h mill showed that they have the maximum power density of was obtained as 0.480 W/cm 2 and maximum current density of as 1.231 A/cm 2 .