Unidimensional Heterostructured LSCF-GDC Nanofiber Film as Oxygen Electrode for Efficient Solid Oxide Cell

Nanofibers hold great promise as oxygen electrode materials in solid oxide cells (SOCs). However, conventional fabrication methods—such as slurry processing and high-temperature sintering—inevitably disrupt their delicate nano-architectures. Here, we propose an innovative self-assembly strategy mediated by current polarization to construct La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -Gd 0.1 Ce 0.9 O 2-δ (LSCF-GDC) nanofiber composite film electrodes. This approach largely preserves the fibrous morphology while promoting coherent heterointerfaces, abundant active sites, and efficient electron/ion pathways. Benefiting from this tailored architecture, the electrode achieves a low polarization resistance of 0.117 Ω cm 2 and a peak power density of 1.482 W cm -2 at 800 °C. Moreover, in CO 2 electrolysis mode, it delivers an impressive current density of 2.30 A cm -2 at 1.8 V. These results establish nanofiber heterostructure films, enabled by current polarization assembly, as a powerful strategy to simultaneously enhance activity, durability, and mass transport, offering new opportunities for high-performance intermediate-temperature SOCs.