Abstract
In this study, the effect of H2S on the cell performance for a SOFC cell of MoNi-Ce/LDC/LSGM/LSFC has been investigated under different concentrations of H2S (0-500 ppm) at 750, 800 and 850 ºC using IV, IS and load demands. The maximum power density decreases with increasing H2S concentration and the reduction of temperature. However, the cell performance remained stable when was demand a load during 1 h in all tests studied. The impedance spectra revealed three distinct rate limiting processes. The high frequency arc is not affected by the H2S concentrations and could be attributed to oxygen ions transfer between the TPB and electrolyte. The intermediate frequency arc is the most sensitive to the anode atmosphere and appears to be associated with the sulphur poisoning process. While the low frequency arc became significantly at high concentrations of H2S (> 50 ppm) then it could be related with gas phase diffusion.
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