Fabrication and Performance of La0.6Sr0.4Co0.2Fe0.8O3−خ´ Infiltrated Yttria Stabilized Zirconia Cathode on Anode Supported Solid Oxide Fuel Cell

Abstract

The three layers with porous yttriastabilized zirconia (YSZ) backbone/dense YSZ/porous NiO–YSZ were fabricated by tapecasting process, respectively, then laminated together and cofired at 1300 آ°C for 5 h. The cathode material La0.6Sr0.4Co0.2Fe0.8O3−خ´ (LSCF) was loaded by infiltrating the precursor of metal ions into porous YSZ backbone. As a result, LSCF nanoparticles with the size of 60–100 nm were uniformly distributed on YSZ backbone. The power density was 1.046 W cm−2 and the polarization resistance was 0.17 خ© cm2 at 800 آ°C in humidified H2 (3 vol.% H2O). But the stability was not good enough, especially in early operating stage, e.g., 20 h. After that, it showed good stability for the following 70 h operating under a constant voltage of 0.7 V at 750 آ°C. This is due to the growth and agglomeration of LSCF nanoparticles at early steps, which reduced the three phase boundaries (TPBs).