Gadolinium-doped ceria (GDC) interlayers are required to prevent the interfacial reaction between La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) cathode and Y₂O₃-stabilized ZrO₂ (YSZ) electrolyte in solid oxide fuel cells (SOFCs). However, it's difficult to prepare a thin and dense GDC interlayer on the sintered half-cell at a low temperature. In this study, the physical vapor deposition (PVD) method was employed to successfully manufacture dense GDC interlayers with the thickness of 1 μm. The influences of GDC sintering temperature (900 °C, 1000 °C and 1100 °C) on cell performance characteristics and degradation behavior were investigated. The cell with GDC interlayer sintered at 1100 °C showed the lowest degradation rate during the 216-h operation. The best stability was attributed to the most effective inhibition of Sr diffusion by the GDC interlayer, which was demonstrated by the almost unchanged Ohmic and polarization resistances during the aging stage and the negligible Sr enrichment at YSZ/GDC interface. Compared to the conventional screen-printed GDC interlayers (sintered above 1250 °C), the GDC interlayer prepared by the PVD method and sintered at 1100 °C was significantly denser and thinner, showing a promising application prospect due to its benefits for cell stability.

需要掺钆二氧化铈 (GDC) 中间层来防止 La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O ₃ (LSCF) 阴极和 Y ₂ O ₃稳定的 ZrO _{2之间的界面反应}(YSZ) 固体氧化物燃料电池 (SOFC) 中的电解质。然而，很难在低温下在烧结半电池上制备薄而致密的 GDC 中间层。在这项研究中，采用物理气相沉积（PVD）方法成功地制造了厚度为 1 μm 的致密 GDC 中间层。研究了GDC烧结温度（900°C、1000°C和1100°C）对电池性能特征和降解行为的影响。在 1100 °C 下烧结的具有 GDC 中间层的电池在 216 小时运行期间表现出最低的降解率。最佳稳定性归因于 GDC 中间层对 Sr 扩散的最有效抑制，这可以通过在老化阶段几乎没有变化的欧姆和极化电阻以及在 YSZ/GDC 界面处可忽略的 Sr 富集来证明。