Coking-Resistance and Sulfur-Tolerance Study of La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ Anode

Abstract

Coking-resistance and sulfur-tolerance study in Solid Oxide Fuel Cell (SOFC) were conducted using La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ (LSCFN) anode with La0.8Sr0.2Ga0.83Mg0.17O3-δ (LSGM) electrolyte. Results show that LSCFN exhibited high catalytic activity in methane combustion reaction, the total conversion temperature of 1% CH4 using LSCFN as catalyst was as low as 650 oC. At 850 oC, the maximum power density of LSCFN||LSGM||Ba0.9Co0.7Fe0.2Nb0.1O3-δ (BCFN) single cell was 693 mW cm-2 and 212 mW cm-2 under H2 and CH4, respectively. Long-term operation of such single cell under methane lasted for 120 hours without degradation. The output power density fueled with H2-50 ppm H2S was stable enough in 120 hours’ operation which indicated a good sulfur-tolerant performance. LSCFN is a promising anode material for SOFC due to its coking-resistant and sulfur-tolerant properties.