Effect of thickness, component and porosity on the polarization resistance of BaCo0.7Fe0.2Nb0.1O3 − δ–Ce0.9Gd0.1O1.95 composite cathode

Abstract

BaCo0.7Fe0.2Nb0.1O3−δ (BCFN)–Ce0.9Gd0.1O1.95 (GDC) composite cathode is synthesized on GDC electrolyte wafer by using a spin coating method. The effects of preparing conditions such as the spin coated times, the amount and size of pore former on the morphological features (thickness and porosity) have been systematically investigated by scanning electron microscopy and X-ray diffraction. It is shown that the thickness, component and porosity play important roles in determining the polarization resistance of the composite cathode. The polarization resistance of BCFN-GDC composite cathode is 1.85, 0.62, 0.25, 0.14 and 0.05Ωcm2 at 600, 650, 700, 750, and 800°C under the optimal preparation parameters, respectively.