摘要
作为一种混合的离子-电子导体材料,掺杂的氧化铈已逐渐被用来作为SOFCs阳极材料或其组成部分之一加以研究,但主要以稀土掺杂剂为主,为了进一步降低采用阳极支撑构型的SOFCs的成本,研究了钙掺杂的氧化铈(CCO)。结果表明,掺杂20%钙的材料(20CCO)的电导率最高,850℃时在氢气气氛下的电导率可以达到0.209S·cm-1,远大于在空气气氛中的电导率。800℃时在空气中的电导率为0.041S·cm-1,比同样温度下阳极中经常采用的钐掺杂的氧化铈(SDC)的电导率低了约0.04S·cm-1。但这并不影响单电池的输出性能,分别以Ni-20CCO作为阳极,Sm0.5Sr0.5Co-SDC作为阴极,SDC作为电解质(厚约35μm)的单电池在650℃,氢气气氛下的最大输出功率可以达到623mW·cm-2。
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) to be used for intermediate-temperature SOFCs (IT-SOFCs) anodes was synthesized in order to reduce the cost of anode-supported SOFCs. Electrical conductivity of 20% calcium-doped ceria (20CCO) reached 0209 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 (0079 S·cm -1 ). Electrochemical performance of Ni-20CCO cermet as anode was investigated using a fuel cell with 35 μm-thick SDC electrolyte and Sm 0.5 Sr 0.5 Co-SDC cathode. Maximum power density reaches 623 mW·cm -2 under humidified (3% H2O) hydrogen at 650 ℃, inferring high catalytic activity of the Ni-20CCO anode.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2005年第3期317-320,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金(20271047)资助项目
新乡市科技发展计划项目(04G118)
关键词
钙掺杂的氧化铈
中温SOFCs
阳极
电导率
稀土
calcium doped ceria
intermediate-temperature SOFCs
anode
electrical conductivity
rare earths
