Investigation of shrinkage behavior of Ni-Fe bimetallic anode tube support and the densification of electrolyte using co-sintering temperature

摘要

NiO-Fe_2O_3/gadolinium-doped CeO_2 (GDC), NiO-Fe_2O_3/yttria-stabilized ZrO_2 (YSZ) anode supported fuel cells were fabricated at co-sintering temperatures of anode-electrolyte from 1250 °C to 1400 °C. The volumetric shrinkage of the anode-electrolytes and the porosity of the anode tube were studied systematically at different temperatures. 1300 °C is the marginal temperature to obtain sufficient electrocatalytic activity of electrodes, and a higher temperature is needed to suppress gas leakage through the scandia-stabilized zirconia (ScSZ) electrolyte. At each co-sintering temperature from 1250 C to 1400 C, the porosity of NiO-Fe_2O_3/GDC anode tubes is nearly 10% higher than that of NiO-Fe_2O_3/YSZ anode tubes. SEM results exhibited the anode-supported electrolyte tends to be more dense as co-sintering temperature increasing to 1400°C from 1250 C. However, the high co-sintering temperature of 1400 C will result in low porosity of anode which negatively affected the power density.