High performance Ni–Fe alloy supported SOFCs fabricated by low cost tape casting-screen printing-cofiring process

Abstract

Novel Ni–Fe alloy supported solid oxide fuel cells, with Ni cermet as functional anode, La0.8Sr0.2MnO3 coated Ba0.5Sr0.5Co0.2Fe0.8O3 as cathode and Gd-doped Ce2O3 as electrolyte, are successfully fabricated by the cost effective method of tape casting-screen printing-cofiring. The Ni–Fe porous substrate is obtained by reduction (in H2 at 650 °C for 2 h) of sintered NiO-10 wt% Fe2O3 consisting of NiO and NiFe2O4. The cell is subjected to evaluation in the aspects of electrochemical performance and redox capability at temperatures between 500 and 650 °C. The result shows a peak power density of 1.04 W cm−2 at 650 °C. Furthermore, the metal support cell exhibits excellent tolerance to redox cycles. Five redox recycles for cells are operated at 600 °C, which shows no significant degradation in open circuit voltage and power density.