Performance and Optimization of Ni/3 mol Y_2O_3-ZrO_2 Anode Supported SOFC

摘要

Ni/8YSZ (8 mol.% yttria stabilized zirconia) composite has been widely used as anode support and provides the major mechanical strength of solid oxide fuel cell (SOFC). In this work, 3 mol% yttria stabilized tetragonal zirconia polycrystal (TZP) instead of 8YSZ was introduced into anode to improve the cell strength and optimize the cell structure. First, Ni/TZP anode supported cell with screen-printing cathode and cell with infiltrating cathode were evaluated. The cell with infiltrating cathode presents a power density of 0.64 W/cm~2 at 800°C, higher than that of the former one (0.51 W/cm~2), due to its better interface and nano-size cathode. Second, GDC was infiltrated into Ni/TZP support, and the modified cell presented an increasing power density of 0.73 W/cm~2. Results suggested the GDC can efficiently extend the reaction sites. Moreover, all the cells showed well stabilities. The results demonstrate that Ni/TZP is a suitable candidate for anode support of SOFC and higher performance can be achieved by optimizing the electrodes.