Alternative anode materials with properties superior to Ni-YSZ are being exploited in this paper. These materials are comprised of mixtures of doped SrTiO3 and doped CeO2, possess good compatibility with an YSZ electrolyte and demonstrate excellent dimensional and chemical stability under thermal and reduction-oxidation cycling. These oxide composites exhibit excellent electrocatalytic activity for hydrogen oxidation in the temperature range 700-950oC. The effect of sulfur impurities in the hydrogen fuel on electrolyte-supported cell performance was studied. Hydrogen sulfide, 50-1,000 ppm, was introduced into the fuel gas and maintained for up to 500 hours. High sulfur contents, 1000 ppm, resulted in 40% performance loss. However, after turning H2S off and supplying the anode with wet hydrogen only, cell performance retuned to the initial value. No hot air or steam was required for the anode recovery. This indicates that the anode material under development is tolerant to sulfur poisoning under the conditions studied.
Revised: August 9, 2010 |
Published: August 6, 2004
Citation
Marina O.A., J.W. Stevenson, and L.R. Pederson. 2004.Sulfur-Tolerant Ceramic Anodes for Solid Oxide Fuel Cells. In Fuel Cell Seminar 2004: Markets and Commercialization, 174. Washington Dc:Fuel Cell Seminar Headquarters.PNNL-SA-42318.