Copper doped SrFe0.9-Cu W0.1O3- (x = 0–0.3) perovskites as cathode materials for IT-SOFCs

Abstract

Cu doped SrFe0.9-xCuxW0.1O3-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 cm2 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.