Copper doped SrFe0.9-xCuxW0.1O3-δ (x = 0–0.3) perovskites as cathode materials for IT-SOFCs

Cu doped SrFe 0.9- x Cu x W 0.1 O 3- δ ( x  = 0, 0.1, 0.2 and 0.3) perovskites were investigated as SOFC cathode materials . The effects of Cu doping on properties of SFCW samples were studied systematically. The oxygen content (3- δ ) decreased by Cu doping, which leading to the decrement of electrical conductivity and the increment of TECs of SFCW samples. The ASR first decreases with x from 0 to 0.2 and then it increases when x up to 0.3. The ASR values are 0.161, 0.134, 0.102 and 0.117 Ω cm 2 at 800 °C for SFCW samples with x  = 0, 0.1, 0.2 and 0.3, respectively. The corresponding activation energy are 0.90, 0.88, 0.78 and 0.86 eV. The lowest ASR and activation energy for ORR of SFCW2 is a result from the joint effects of electrical conductivity , oxygen vacancy concentration and thermal expansion caused by Cu doping. The research results obtained in this study suggesting SFCW2 is a good cathode candidate for SOFC.