A systematic study was initiated of anode-supported solid oxide fuel cells (SOFCs) with cathodes. This type of cathode, a mixed conducting -type material, can be considered as a candidate for SOFC applications. In this study, the influence of (1) the presence of a (CGO) interlayer between the electrolyte and the cathode, (2) sintering conditions, and (3) the grain size of the powder on the performance of SOFCs with cathodes was investigated in more detail. Results from current density-voltage characteristics and permeation and gas diffusion measurements showed that the electrochemical performance was promising for SOFCs including a CGO interlayer and a cathode (prepared with a powder with a of or ) sintered at or higher; current density at and between 1.2 and . The microstructure of the cathode was such that no gas diffusion problems occurred.