Abstract
Influence of H 2 S fuel impurity on power generation characteristics of SOFCs has been analyzed by measuring cell voltage at a given current density, as a function of operational temperature, H 2 S concentration, and fuel gas composition. Reversible cell voltage drop was observed around 1000°C, but fatal irreversible degradation occurred at lower operational temperatures, at higher H 2 S concentrations, and at lower fuel H 2 /CO ratios. Sulfur tolerance of SOFCs improved by using Sc 2 O 3 -doped ZrO 2 instead of Y 2 O 3 -doped ZrO 2 as electrolyte and/or as electrolyte component in the anode cermet. It has been found that H 2 S poisoning consists of at least two stages, i.e. an initial cell voltage drop within a few minutes to a metastable cell voltage, followed by a gradual larger cell voltage drop associated with the agglomeration of Ni particles.
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