Fe, Ni Doping for Performance Optimization of Sm1-Xprxbafe2-Yniyo5+Δ (X=0, 0.1, 0.3, Y=0, 0.4) Symmetrical Electrode Material for Solid Oxide Cell

Symmetrical solid oxide cell (SSOC) using the same electrode material as both cathode and anode can simplify the preparation process and enhance the durability of cell. In this study, the Pr and Ni doping SmBaFe2O5+δ (SBF) of Sm0.9Pr0.1BaFe2O5+δ (SPBF91) Sm0.9Pr0.1BaFe1.6Ni0.4O5+δ (SPBFN) as symmetrical electrodes for SSOC were successfully prepared and studied its properties. First principles calculation indicates that the oxygen vacancy formation energy of SPBF91, SPBFN was lower than that of SBF. In addition, the doping of Pr and Ni significantly reduced the band center energy of Fe-3d and O-2p in SPBFN. At 800 ℃, the polarization resistance of SPBFN as oxygen electrode and fuel electrode were 0.025 Ωcm2, and 0.11 Ωcm2, respectively. At 800 ℃, using H2, CH3OH, and wet C3H8 as fuel, the Pmax of fuel cell with SPBFN as a symmetrical electrode reached 850, 651 and 648mW/cm2, respectively. The FeNi alloy on the anode surface significantly improved the output performance and stability of SPBFN symmetrical electrode with CH3OH as fuel. Furthermore, H2-50%H2O electrolysis and CO2 electrolysis using SPBFN as a symmetrical electrode also exhibited good stability during 200 h test.