Fabrication and study of LaNi0.6Fe0.4O3-δ and Sm0.5Sr0.5CoO3-δ composite cathode for proton-conducting solid oxide fuel cells

Herein, new composite cathode material, aiming at optimizing the cell performance of BaCe 0.7 Y 0.2 Zr 0.1 O 3-δ (BZCY)-based proton-conducting solid oxide fuel cell(H-SOFC), is investigated through mingling LaNi 0.6 Fe 0.4 O 3-δ (LNF) with Sm 0.5 Sr 0.5 CoO 3-δ (SSC) at different ratios (1:0, 7:3, 5:5, 0:1 wt%). The phase structure of the fabricated cathode powders is analyzed through the X-ray diffraction method (XRD) and no second phase is observed at 1000 °C, showing good chemical compatibility. The electrochemical properties consisting of I-V and EIS curves reveal that the single-cell with LNF-SSC73 cathode has the best electrochemical performance, exhibiting a polarization resistance of 0.039 Ω·cm 2 and a relatively high maximum power density of 1427 mWcm 2 at 700 °C. These results above indicate that LNF-SSC73 composite material could improve the performance of fuel cells, which would be a prospective material in the field of H-SOFC.