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Preparation of In⁃Situ Precipitated SOFC Composite Anode Based on Fe⁃Based Perovskite
Xu Jingsheng， Cai Hongdong， Zhang Leilei， Yao Guibin， Song Zhaoyuan
The Mo ions with high valence state in La0.5Sr0.5Fe0.9Mo0.1O3-
δ
(LSFM) were partially substituted by trace amounts of Ni, which was found to weaken the structural stability of La0.5Sr0.5Fe0.9Mo0.1O3-
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 La0.5Sr0.5Fe0.9Mo0.07Ni0.03O3-
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 La0.5Sr0.5Fe0.9Mo0.1O3-
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%.
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