Synergistic Ce/In dual-doping in La0.3Sr0.7FeO3−δ: breaking the activity–stability trade-off in SSOFC electrodes

Abstract

This study develops La_0.3Sr_0.6Ce_0.1Fe_0.9In_0.1O_3−δ (LSCeFIn-0.1) as a symmetric electrode for symmetrical solid oxide fuel cells (SSOFCs) through Ce/In dual-doping. Ce stabilizes the perovskite structure, while In enhances oxygen vacancy concentration and O²⁻ mobility. The LSCeFIn-0.1 exhibits low polarization resistances of 0.097 Ω cm² in H₂ and 0.037 Ω cm² in air. The LSGM-based cells achieve a peak power density (PPD) of 1049 mW cm⁻² and demonstrate stable operation over 300 h at 800 °C. Dual-doping effectively balances structural stability and ion transport, advancing perovskite electrodes for efficient SSOFCs.