Fabrication and evaluation of a Ni/La_(0.75)Sr_(0.25)Cr_(0.5)Fe_(0.5)O_(3-δ) co-impregnated yttria-stabilized zirconia anode for single-chamber solid oxide fuel cells

摘要

In this study, an anode-supported solid oxide fuel cell (SOFC) has been prepared using a porous yttria-stabilized zirconia (YSZ) anode matrix. The anode was prepared by impregnating the sintered porous YSZ matrix with a nitrate aqueous containing La~(3+), Sr~(2+), Cr~(3+), Fe~(3+), Ni~(2+) and urea. The formed anode exhibited high surface area and porosity, and had fast path for the transportation of oxygen ion and electron, as well as resulting in high three-phase boundaries (TPBs). Single-chamber fuel cell test was conducted in a methane-oxygen gas mixture using an YSZ membrane as the electrolyte and La_(0.8)Sr_(0.2)MnO_(3-δ) (LSM) as the cathode. The influences of environmental temperature and gas composition on the cell performance were also investigated. Under the optimized gas composition (CH_4/O_2 = 2/ 1) and furnace temperature (800 ℃) conditions, a maximum power density of 214 mW cm~2 was achieved. The test results demonstrated good cell stability and indicated that the perovskite oxide-based anodes were quite robust with redox cycling.