Electrospinning La_(0.8)Sr_(0.2)Co_(0.2)Fe_(0.8)O_(3-δ) tubes impregnated with Ge_(0.8)Gd_(0.2)O_(1.9 nanoparticles for an intermediate temperature solid oxide fuel cell cathode

摘要

In order to reduce the polarization resistance of the cathode, we have developed one-dimensional (ID) nanostructured La_(0.8)Sr_(0.2)Co_(0.2)Fe_(0.8)O_(3-δ) (LSCF) tubes/Ce_(0.8)Gd_(0.2)O_(1.9) (GDC) nanoparticles composite cathodes for solid oxide fuel cell. Uniform LSCF/PVP composite nanofibers have been firstly synthesized by a single-nozzle electrospinning technique, followed by firing at 800 ℃ for 2 h to form one-dimensional LSCF tubes. Subsequently, the GDC phases were introduced into tube structured LSCF scaffold pre-sintered on a GDC pellet by a multi-impregnation process. Electrochemical Impedance spectra reveal that nanostructured LSCF tubes/GDC nanoparticles composite cathodes have a better electro-chemical performance, achieving area-specific resistances of 4.70,1.12,0.27 and 0.07 O cm~2 at 500, 550,600 and 650 ℃ for the composite of GDC and LSCF in a weight ratio of 0.52:1. The low ASR values are mainly related to its optimal microstructure with larger triple-phase boundaries and higher porosity. These results suggest that LSCF tube/GDC nanoparticle composite can be an alternative cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC).