Abstract: The Mo ions with high valence state in La_0.5Sr_0.5Fe_0.9Mo_0.1O_3-δ (LSFM) were partially substituted by trace amounts of Ni, which was found to weaken the structural stability of La_0.5Sr_0.5Fe_0.9Mo_0.1O_3-δ under reducing atmosphere. In this way, Fe⁃Ni alloy nanoparticles precipitated on the surface of the oxidized perovskite under reducing atmosphere, and a composite anode then be prepared showing improved catalytic properties, electrochemical characterizations of which were evaluated. The experimental results indicate that power densities of single cell using La_0.5Sr_0.5Fe_0.9Mo_0.07Ni_0.03O_3-δ (LSFMN0.03) as anode are 0.84 W/cm² and 0.62 W/cm² (800 ^oC) with polarization resistance of 0.35 Ω·cm² and 1.01 Ω·cm² (800 ^oC) under H₂ and CO fuels, respectively. The performances of cell with LSFMN0.03 anode are obviously higher than that of La_0.5Sr_0.5Fe_0.9Mo_0.1O_3-δ anode. The results of stability tests indicate that, the cell with LSFMN0.03 anode could maintain an excellent electrochemical stability, when the H₂ content in H₂/CO mixture fuel is more than 40%.

Key words: SOFC, Anode, In?suit, Fe?Ni alloy

摘要： 使用微量的Ni替换La_0.5Sr_0.5Fe_0.9Mo_0.1O_3-δ（LSFM）中高价态的Mo离子，通过破坏其还原气氛下的稳定性，在阳极还原气氛下电极表面原位析出Fe⁃Ni合金纳米颗粒，从而制备出高催化性能的复合阳极催化剂，并对其作为SOFC阳极的性能进行电化学表征。实验结果显示，La_0.5Sr_0.5Fe_0.9Mo_0.07Ni_0.03O_3-δ(LSFMN0.03)阳极制备的单电池在H₂和CO燃料下功率密度分别达到0.84 W/cm²和0.62 W/cm²(800 ^oC)，相应的极化阻抗分别为0.35 Ω·cm²和1.01 Ω·cm²(800 ^oC)。LSFMN0.03阳极的性能显著优于LSFM阳极。稳定性测试表明，H₂/CO混合燃料中的H₂比例大于40%时，以LSFMN0.03作阳极的单电池能保持良好的稳定性。

关键词: SOFC, 阳极, 原位析出, Fe?Ni合金