0.6Sr 0.4Fe 0.9Ni 0.1O 3-δ perovskites as anode for solid oxide fuel cells]]>

摘要

The Mo-doped La0.6Sr0.4Fe0.9Ni0.1O3-δ(LSFNM) material is synthesized by a sol-gel method as a SOFC anode. XRD results explain that La0.6Sr0.4Fe0.9Ni0.1O3-δ(LSFN) is decomposed severely above 800?°C in reducing atmosphere, while LSFNM basically maintains the cubic perovskite main phase, and only a small quantity of heterophase appears. Apparently, Mo doping can improve the reduction stability of material. Meanwhile, Mo6+effectively suppresses the reduction of the Fe4+/Fe3+electron pair in reducing atmosphere, which enhances the electrical conductivity. In 5% H2-Ar, the conductivity of Mo-doped sample is increased from 0.75 to 2.8?S?cm?1at 800?°C, which is more in line with the requirement of the anode. LSFNM exhibits lower polarization resistance (Rp) than LSFN in wet H2; for example, the Rpvalues of LSFN and LSFNM at 850?°C are 0.25 and 0.18?Ω?cm2. The maximum power density (Pmax) of the LSGM-supported single cell is increased from 740 to 975?mW?cm?2in H2at 850?°C, and the cell exhibits reasonable stability at 700?°C for 100?h. Thus, it is rational to consider that the LSFNM is a potential material for IT–SOFC anode.