Sulfur Tolerance of Au-Mo-Ni/GDC SOFC Anodes Under Various CH4 Internal Steam Reforming Conditions

The present work refers to the short communication of a first series of obtained results on how Au and/or Mo addition can affect the stability of modified Ni/GDC anodes for the reaction of internal CH₄ steam reforming, in the presence of H₂S. Specifically, it is shown that Ni/GDC is stable in the presence of 10 ppm H₂S, but only in the case where 100 vol% of H₂ is the anode feed. In the case where CH₄ and H₂O (diluted in Helium carrier gas) comprise the anode feed, then at ratios equal to S/C = 2 or S/C = 0.13 the performance of Ni/GDC shows severe degradation, while the Au-Mo-Ni/GDC anode has the best and most stable electrocatalytic behavior. Finally, the effect of the electrocatalyst`s loading on the sulfur tolerance is also investigated.