Single phase materials based on Co-doped SrTiO3 for mixed ionic-electronic conductors applications

► SrTi1−xCoxO3−δ solid solutions were prepared by standard ceramic technology. ► Samples with x = 0−0.25 are single-phase. ► Co-doping increases conductivity and O2 permeability of SrTi1−xCoxO3−δ membrane. ► Co-doped samples are not stable at low pO2 due to the reduction of Co-ions.