High-performance SOFCs with impregnated Sr2Fe1.5Mo0.5O6-δ anodes toward sulfur resistance

High-performance Sr2Fe1.5Mo0.5O6-δ-Gd0.1Ce0.9O2-δ (SFM-GDC) anode-supported solid oxide fuel cells (SOFCs) have been fabricated by low temperature co-sintering and wet impregnation techniques. Crack-free GDC electrolyte layer was obtained by sintering at low temperature of 1150 °C under Li2O sintering aid. With impregnated SFM nano-catalyst, the cell polarization resistance is significantly reduced compared with that prepared by traditional physical mixing method. Using Ba0.9Co0.7Fe0.2Nb0.1O3-δ (BCFN) cathode, the maximum power densities of the as-prepared SOFCs can reach 445 mW cm−2 at 700 °C when using H2 as fuel and ambient air as oxidant. In addition, the as-prepared SFM-GDC anode exhibits excellent sulfur tolerance toward H2 with 100 ppm H2S. The relatively weak sulfur adsorption on surface and limited lattice interstitial sites within perovskite structure might be the possible sulfur tolerant mechanism of SFM anodes.