摘要
采用硝酸盐-柠檬酸溶胶-凝胶低温自蔓延燃烧法制备GDC粉末，用共压法制备了NiO-GDC单层阳极、NiO/NiO-GDC双层阳极及其单电池，并测试了其性能。研究结果表明：经H2还原后，Ni/Ni-GDC双层阳极外层为多孔结构，由粒径较大的Ni粒子团形成了稳定的电子电导通道及燃料通道；内层孔隙较小、较少，Ni均匀分布于GDC构成的支撑骨架中。Ni/Ni-GDC双层阳极的孔隙率及电导率都高于Ni-GDC单层阳极，从450～700℃，其电导率比Ni-GDC单层阳极都稳定高出15%～20%。单电池的测试结果表明：Ni/Ni-GDC双层阳极支撑单电池在700、650、600℃的最大功率密度分别为0.383、0.329、0.204 W/cm2，比Ni-GDC单层阳极支撑单电池分别高出了8.95%、79.38%、84.76%。Ni/Ni-GDC双层阳极支撑单电池具有比Ni-GDC单层阳极支撑单电池更高的中温、特别是低温电化学性能。
GDC electrolyte powder was synthesized by nitrate-citric acid sol-gel auto combustion method in low temperature. NiO-GDC single-layer anode, NiO/NiO-GDC double-layer anode and their single cells were prepared by co-pressing, then their properties were tested. The test results show that after reduction by H2, the outer layer of the Ni/Ni-GDC double-layer anode is porous and stable electronic conductivity channel and fuel channel is formed by the Ni particle groups with large size. In the inner layer, pores are less and smal er, and Ni particles distribute uniformly in the skeleton structure formed by GDC particle. Both the porosity and conductivity of Ni/Ni-GDC double-layer anode are higher than Ni-GDC single-layer anode; its conductivities from 450 to 700℃are al 15%~20%higher than Ni-GDC single-layer anode. The single celltest shows that the peak power densities of Ni/Ni-GDC double-layer anode-supported single cellat temperature 700, 650 and 600℃are respectively 0.383, 0.329 and 0.204 W/cm2, which are respectively 8.95%, 79.38%, 84.76%higher than the Ni-GDC single-layer anode-supported single cell. Ni/Ni-GDC double-layer anode-supported single cells have higher electrochemical performance than Ni-GDC single-layer anode-supported single cellat intermediate temperature, especial y at low temperature.
出处
《电源技术》
CAS
CSCD
北大核心
2015年第4期775-777,789,共4页
Chinese Journal of Power Sources
