Preparation and Performance Study of One-Dimensional Nanofiber-Based Sm_0.5Sr_0.5CoO_3-s-Gd_0.2Ce_0.8O_1.9 Composite Cathodes for Intermediate Temperature Solid Oxide Fuel Cells

摘要

Electrospinning is employed to fabricate Sm0.5Sr0.5CoO3- (SSC) nanofibers. One-dimensionalnanofiber-based Sm0.5Sr0.5CoO3--Gd0.2Ce0.8O1.9 (SSC-GDC) composite cathodes for solid oxide fuelcell (SOFC) are fabricated by infiltrating the GDC precursor solution into the SSC nanofibers2 scaffolds. Optimal polarization resistance of 0.038 cm at 650 C is achieved when SSC:GDC massratio of 1:0.869 for infiltration is used. This value is 2.6 times smaller than the polarization resistanceof nanoparticle-based SSC-GDC composite under identical testing conditions. Microstructural featuresof the SSC-GDC interface further support the cell performance results. The nanofiber-based SSC-GDCcomposite is proved to be an excellent candidate as cathode material for intermediate temperatureSOFCs.