Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd_0.1Ce_0.9O_1.95 (GDC) embedded Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ particles in ∼200 nm size and Gd(NO₃)₃/Ce(NO₃)₃ precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m² g⁻¹, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd_0.1Ce_0.9O_1.95 embedded Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm⁻² at 550 °C and 1.02 W cm⁻² at 600 °C, respectively.

控制三相边界（TPB）是离子导体，电子导体和气相的主要反应部位，是提高低温固体氧化物燃料电池电池性能的关键。我们报告了形态学上明确定义的Gd _0.1 Ce _0.9 O _1.95（GDC）嵌入Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ（BSCF）纳米纤维的合成及其作为阴极的电化学性能。用包含结晶Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ的聚合物溶液制备的电纺纤维最佳尺寸重量比为3：2的约200 nm大小的颗粒和Gd（NO ₃）₃ / Ce（NO ₃）₃前体导致一维结构，即使在1000°C高温煅烧后也不会出现严重的团聚和形态塌陷。与GDC / BSCF复合颗粒和核-壳纳米纤维相比，所制备的纳米纤维具有沿纤维轴向的快速电子路径，7.5 m ²  g ^-1更大的表面积以及在TPB处更多的氧反应位点。结果，Gd _0.1 Ce _0.9 O _1.95嵌入Ba _0.5 Sr _0.5 Co _0.8 Fe_0.2 O3 _-δ纳米纤维电池在550°C下的最大功率密度为0.65 W cm ^-2，在600°C下的最大功率密度为1.02 W cm ^-2，具有出色的性能。