Abstract:
The fabrication of porous and stereoscopic anode is crucial for the effective use of dry methane as fuel in solid oxide fuel cells (SOFCs). In this work, tubular SDC coated with Ni
0.5Cu
0.5Ba
0.05O
x (Ni
0.5Cu
0.5Ba
0.05O
x/SDC) was prepared by hard template method combined with wet impregnation method. For comparison, Ni
0.5Cu
0.5Ba
0.05O
x powder was also prepared by sol-gel method and then mixed with SDC to get anode Ni
0.5Cu
0.5Ba
0.05O
x-SDC. Corresponding electrolyte-supported unit cells Ni
0.5Cu
0.5Ba
0.05O
x/SDC|YSZ|LSM-YSZ and Ni
0.5Cu
0.5Ba
0.05O
x-SDC|YSZ|LSM-YSZ were then fabricated for the power generation performance and long-term stability test. Fueled with dry methane at 800℃ on a fuel cell with Ni
0.5Cu
0.5Ba
0.05O
x-SDC as anode, the maximum power density is only 324.99 mW/cm
2 and the voltage drops 5.60% after 10 h operation; however, with Ni
0.5Cu
0.5Ba
0.05O
x/SDC as the anode, the maximum power density reaches 384.54 mW/cm
2 and no degradation in voltage is observed for 100 h. As reveled by SEM, the narrow pores in Ni
0.5Cu
0.5Ba
0.05O
x-SDC anode are prone to block by carbon deposition; in contrast, Ni
0.5Cu
0.5Ba
0.05O
x/SDC has a three-dimensional porous structure for the diffusion of fuel and reactant gas. The surface of SDC fiber tube is coated by the catalyst particles, which can improve the three phase boundary and enhance the cell stability.