One dimensional La_(0.8)Sr_(0.2)Co_(0.2)Fe_(0.8)O_(3-δ)/Ce_(0.8)Gd_(0.2)O_(1.9) nanocomposite cathodes for intermediate temperature solid oxide fuel cells

摘要

One dimensional La_(0.8)Sr_(0.2)Co_(0.2)Fe_(0.8)O_(3-δ) (LSCF) nanorod/Ce_(0.8)Gd_(0.2)O_(1.9)(GDC) nanoparticle composite cathode has been fabricated by infiltrating the GDC precursor solution into LSFC scaffolds consisting of LSCF nanorods prepared with an electrospinning technique. For comparison, LSCF/GDC nanoparticle cathodes are also obtained using the same method. Impedance analysis reveals that nanorod structured LSCF/GDC cathode has a better electrochemical performance than that of the pure nanorod LSCF cathode, achieving a polarization resistance of 0.10 Ω cm~2 at 650 ℃ for the GDC loading of 160 μL, corresponding to about 50 wt.% GDC. Especially, the polarization resistance of nanorod LSCF/GDC cathode with 160 μL loading displays 5 times smaller than that of LSCF/GDC nanoparticle cathode with an optimal GDC loading of 80 μL at 650 ℃, mainly due to its optimal structure with larger LSCF/GDC boundaries and higher porosity. These results imply that LSCF nanorod/GDC nanoparticle composite is a promising cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC).