The chemical side reaction between a lanthanum strontium cobalt ferrite (LSCF) cathode and an yttria-stabilized zirconia (YSZ) electrolyte is a key problem for solid oxide fuel cell (SOFC) fabrication. Herein, we demonstrate rapid fabrication of an LSCF cathode using a novel flash light sintering (FLS) technique to suppress the chemical side reaction; notably, no Gd-doped ceria interlayer is required. The FLS-fabricated LSCF cathode shows comparable crystalline development and microstructural evolution to a cathode fabricated using the conventional high-temperature sintering process. A clear LSCF/YSZ interface appears, indicating suppression of detrimental chemical side reactions via rapid and surface-dominant sintering kinetics. Detailed interfacial microstructure analysis reveals the absence of Sr segregation and SrZrO₃ formation at the FLS-LSCF cathode/YSZ electrolyte interface. Remarkable performance of 0.9 W cm^–2 power density at 750 °C is achieved for a cell incorporating the rapidly fabricated LSCF cathode on the interlayer-free YSZ electrolyte owing to suppression of the insulating secondary phases and significantly reduced polarization resistance. Hence, rapid LSCF cathode fabrication via the novel FLS method effectively suppresses secondary phase formation at the LSCF/YSZ interface and greatly simplifies SOFC fabrication by eliminating the doped-ceria-based interlayer. Moreover, this novel method could help overcome interfacial chemical reaction problems in various solid-state devices, while also providing new application opportunities for high-performance electrolyte/electrode materials.

镧锶钴铁氧体 (LSCF) 阴极与氧化钇稳定的氧化锆 (YSZ) 电解质之间的化学副反应是固体氧化物燃料电池 (SOFC) 制造的关键问题。在此，我们展示了使用新型闪光烧结 (FLS) 技术来抑制化学副反应的快速制造 LSCF 阴极；值得注意的是，不需要掺杂 Gd 的氧化铈中间层。FLS 制造的 LSCF 阴极显示出与使用传统高温烧结工艺制造的阴极相当的晶体发展和微观结构演变。出现清晰的 LSCF/YSZ 界面，表明通过快速和表面主导的烧结动力学抑制了有害的化学副反应。详细的界面微观结构分析表明没有 Sr 偏析和 SrZrO ₃FLS-LSCF 正极/YSZ 电解质界面处的形成。由于绝缘二次相的抑制和极化电阻的显着降低，在无夹层 YSZ 电解质上结合快速制造的 LSCF 阴极的电池在 750°C 下实现了0.9 W cm ^–2功率密度的卓越性能。因此，通过新型 FLS 方法快速制造 LSCF 阴极有效地抑制了 LSCF/YSZ 界面处的二次相形成，并通过消除掺杂氧化铈基中间层大大简化了 SOFC 制造。此外，这种新方法有助于克服各种固态器件中的界面化学反应问题，同时也为高性能电解质/电极材料提供了新的应用机会。