A self-assembled composited cathode coated with dual-exsolved core–shell FeNi@FeOx nanoparticles as efficient CO2 reduction electrocatalysts

Solid oxide electrolytic cells (SOECs) enable efficient electrochemical reduction of CO 2 into CO, providing a sustainable solution for greenhouse gas mitigation. Nevertheless, the scarcity of stable and highly active cathode materials for the real application of SOECs is a serious challenge. Herein, a novel self-assembled composed cathode of Ni co-doped (Pr 0.5 Sr 0.5 ) 0.95 Fe 0.9 Nb 0.1 O 3-δ -Gd 0.1 Ce 0.9 O 2-δ (PSFNNb-GDC) is proposed as an efficient CO 2 electrolysis. The NiFe/FeO x nanoparticles with a core–shell structure are uniformly deposited onto the surface of the PSFNNb-GDC cathode. La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM)-based single cell with NiFe/FeO x @PSFNNb-GDC cathode achieve excellent performance (1.33 A cm −2 at 850 ° [email protected]  V) and stability (800 ° [email protected] V) in long-term operation. The performance enhancement original from increased surface oxygen vacancies and in situ formed FeNi@FeO x core–shell nanoparticles. This research highlights the potential of rational structural design of SOECs cathode materials in advancing the field of CO 2 utilization