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V2O3 Anode Catalyst for Solid Oxide Fuel Cell using H2S-containing Hydrogen

A new vanadium oxide based anode catalyst V2O3-YSZ was developed for the purpose of direct use of hydrogen sulfide-containing hydrogen in solid oxide fuel cell systems. H2S-containing hydrogen (H2 balanced with 5000 ppmv H2S) and air were used as anode and cathode feed gas, respectively. The V2O3-YSZ catalyst showed good catalytic activity for conversion of H2S-containing hydrogen in the SOFC systems. Current density over 450 mA/cm 2 at 0.5 V and maximum power density of 160 mW/cm 2 (at 400 mA/cm 2 ) were obtained at 900˚C. Conductivity tests showed that the V2O3 catalyst had good electronic conductivity in hydrogen atmosphere. XRD and XPS analysis showed that the new catalyst was stable in the environment of H2S-rich hydrogen, and this was confirmed experimentally in fuel cell tests.