Research on Calcium Doped Ceria Used in Intermediate-Temperature SOFCs Anodes  

作　　者：尹艳红 李少玉 朱威 夏长荣 孟广耀 

机构地区：[1]College of Chemistry and Environmental Science , Henan Normal Unviersity, Xinxiang 453007 , China [2]Department of Materials Science and Engineering, University of Science and Technology of China , Hefei230026 , China [3]College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007 , China

出　　处：《Journal of Rare Earths》2005年第4期433-436,共4页稀土学报（英文版）

基　　金：Project supported bythe National Natural Science Foundation of China (20271047)

摘　　要：As a mixed ion-electronic conductor, doped ceria, especially rare earth doped ceria, were used as anodes or components of anodes in SOFCs. In this work, calcium doped ceria （CCO） was synthesized to be used in intermediate-temperature SOFCs （IT-SOFCs） anodes in order to reduce the cost of anode-supported SOFCs. Electrical conductivity of 20% calcium doped ceria （20CCO） reached 0.209 S·cm^-1 in hydrogen at 850 ℃, and 0.041 S·cm^-1 in air at 800℃, which is about 0.04 S·cm^-1 lower than that of conventional samaria-doped ceria （0.079 S·cm^-1）. Electrochemical performance of Ni-20CCO cermet as anode was investigated using a fuel cell with 35μm-thick SDC electrolyte and Sm0.5Sr0.5 Co-SDC cathode. Maximum power density was 623 mW·cm^-2 under humidified （3% H2O） hydrogen at 650 ℃, inferring high catalytic activity of the Ni-20CCO anode.As a mixed ion-electronic conductor, doped ceria, especially rare earth doped ceria, were used as anodes or components of anodes in SOFCs. In this work, calcium doped ceria （CCO） was synthesized to be used in intermediate-temperature SOFCs （IT-SOFCs） anodes in order to reduce the cost of anode-supported SOFCs. Electrical conductivity of 20% calcium doped ceria （20CCO） reached 0.209 S·cm^-1 in hydrogen at 850 ℃, and 0.041 S·cm^-1 in air at 800℃, which is about 0.04 S·cm^-1 lower than that of conventional samaria-doped ceria （0.079 S·cm^-1）. Electrochemical performance of Ni-20CCO cermet as anode was investigated using a fuel cell with 35μm-thick SDC electrolyte and Sm0.5Sr0.5 Co-SDC cathode. Maximum power density was 623 mW·cm^-2 under humidified （3% H2O） hydrogen at 650 ℃, inferring high catalytic activity of the Ni-20CCO anode.

关 键 词：calcium doped ceria intermediate-temperature SOFCs electrical conductivity rare earths 

分 类 号：TM911.4[电气工程—电力电子与电力传动]