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

Abstract The Mo-doped La 0.6 Sr 0.4 Fe 0.9 Ni 0.1 O 3-δ (LSFNM) material is synthesized by a sol-gel method as a SOFC anode. XRD results explain that La 0.6 Sr 0.4 Fe 0.9 Ni 0.1 O 3-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% H 2 -Ar, the conductivity of Mo-doped sample is increased from 0.75 to 2.8 S cm−1 at 800 °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 °C are 0.25 and 0.18 Ω cm2. 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 °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. Graphical abstract Image Highlights • La 0.6 Sr 0.4 Fe 0.8 Ni 0.1 Mo 0.1 O 3-δ (LSFNM) is used as anode electrode for SOFC. • Mo doping significantly improves stability in reducing atmosphere. • The conductivity of LSFNM reaches 2.8 S cm−2 at 800 °C in 5% H 2 -Ar. • LSFNM exhibits higher hydrogen oxidation reaction (HOR) activity than LSFN. • Maximum power density of 975 mW cm−2 in H 2 is obtained at 850 °C for LSFNM. [ABSTRACT FROM AUTHOR]