High performance of Mo-doped La0.6Sr0.4Fe0.9Ni0.1O3-delta perovskites as anode for solid oxide fuel cells

The Mo-doped La0.6Sr0.4Fe0.9Ni0.1O3-delta (LSFNM) material is synthesized by a sol-gel method as a SOFC anode. XRD results explain that La0.6Sr0.4Fe0.9Ni0.1O3-delta (LSFN) is decomposed severely above 800 degrees 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% H-2-Ar, the conductivity of Modoped sample is increased from 0.75 to 2.8 S cm(-1) at 800 degrees C, which is more in line with the requirement of the anode. LSFNM exhibits lower polarization resistance (R-p) than LSFN in wet H-2; for example, the R-p values of LSFN and LSFNM at 850 degrees C are 0.25 and 0.18 Omega.cm(2). The maximum power density (P-max) of the LSGM-supported single cell is increased from 740 to 975 mW cm(-2) in H-2 at 850 degrees C, and the cell exhibits reasonable stability at 700 degrees C for 100 h. Thus, it is rational to consider that the LSFNM is a potential material for IT-SOFC anode. (C) 2018 Elsevier Ltd. All rights reserved.