Study of dopants on the properties of Ca3Co4O9-δ cathode materials for IT-SOFCs

• Main Authors: Jing-Han Chang, 張淨涵
• Other Authors: 王錫福
• Format: Others
• Online Access: http://ndltd.ncl.edu.tw/handle/2sh736

碩士 === 國立臺北科技大學 === 材料及資源工程系所 === 103 === The purpose of this study was to improve Ca3Co4O9-δ (CCO) cathode for SOFC (Solid Oxide Fuel Cell). In order to achieve the best conductivity of cathode materials, the cathode were doped with various ions radii including Bi3+ , Sr2+, Ce4+, Cu2+, Mo6+ and W6+, to partly substitute the ion Ca2+ and Co3+. Various oxides including Bi2O3 SrCO3, CeO4, CuO, MoO3 and WO3 were added into Ca3Co4O9-δ with various quantities, and then sintered at 975oC to 1050oC, to explore their effects on the conductive properties. In this study, we found that small amount of Bi2O3 dopant can improve the densification and reduce sintering temperature. Doped with different ions can enhance the conductivity of the CCO, the results indicated that Bi3+, Ce4+, Mo6+, and Cu2+ can significantly improve the low-temperature conductivity. When partially Co3+ replaced by Cu2+, Ca3Co4-xCuxO9-δ with x = 0.1 can reach the best conductivity of 222.93 S/cm at 800oC.