Ce³⁺-induced in situ reconstruction of LaFe0.7Ni0.3O3-δ into three-phase nanocomposite cathode for IT-SOFCs

Abstract

Self-constructing multiphase nanocomposites offer a promising strategy for developing high-performance IT-SOFC cathodes. Herein, three-phase nanocomposites La1-xCexFe0.7Ni0.3O3-δ (denoted as LCFNx, x=0.1-0.3) are in situ self-constructed via Ce³⁺ doping at the La site in LaFe0.7Ni0.3O3−δ(LFN), forming a perovskite main phase M-LCFN with surface-decorated secondary phases of NiO and CeO2. Benefiting from the synergistic interaction among phases, the optimized LCFN0.2 exhibits desirable performance including low area-specific resistance (ASR) of 0.022 Ω·cm2, a remarkable peak power density of 2.36 W·cm-2 at 800 °C and long-term stability for 200 h at 700 °C.