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

Abstract

Herein, three-phase nanocomposites La_1−xCe_xFe_0.7Ni_0.3O_3−δ (denoted as LCFNx, x = 0.1–0.3) are self-constructed in situ via Ce³⁺ doping at the La site in LaFe_0.7Ni_0.3O_3−δ (LFN), forming a perovskite main phase (M-LCFN) with surface-decorated secondary phases of NiO and CeO₂. The optimized LCFN0.2 exhibits a 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.