Performance of Gd_0.2Ce_0.8O_1.9 infiltrated La_0.2Sr_0.8TiO₃ nanofiber scaffolds as anodes for solid oxide fuel cells: Redox stability and effects of electrolytes

Nanofiber-based La_0.2Sr_0.8TiO₃-Gd_0.2Ce_0.8O_1.9 (LST-GDC) composite anodes show good electrochemical performance and microstructure stability when subjected to reduction and oxidation (redox) cycling. With the increasing amount of GDC, the polarization resistance of LST-GDC composite anode gradually decreases. The porous LST nanofiber scaffold in the composite anode buffers the volume change caused by the transition between Ce⁴⁺ and Ce³⁺, which improves the LST-GDC electrode redox stability. A comparative study of the electrochemical performance of the composite anode has been conducted with 1 mol%CeO₂-10 mol%Sc₂O₃-89 mol%ZrO₂ (ScSZ), 8 mol% yttria stabilized zirconia (YSZ) and La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ (LSGM) electrolytes to evaluate the effects of electrolytes with different oxygen ion conductivity on anode interfacial polarization resistance. Among the three electrolytes, the LST-GDC composite anode with LSGM as the electrolyte shows the best electrochemical performance due to the electrolyte high O^2- conductivity.