Development of Carbon and Sulphur Tolerant Anodes of Solid Oxide Fuel Cells

摘要

GDC-impregnated Ni/GDC anodes show the significant enhancement of the sulfur-tolerance of the anodes. However, the microstructure of GDC- impregnated Ni/GDC anodes still changes significantly in H2S-H2, indicating that GDC nanoparticles may not be able to completely inhibit the poisoning effect of sulfur on Ni/GDC anodes under present conditions studied. Co- impregnation of Pd-CeO2 was found to be most effective to enhance the activity of the Ni/GDC anodes for the hydrogen oxidation reaction in H2S-H2 and the polarization performance is stable under the condition of 100 ppm H2S-H2 and 200 mAcm-2 at 800oc for 50 hrs. Most important, the SEM results indicate that the impregnated Pd-CeO2 nanoparticles are effective to retard the poisoning effect of sulfur on the microstructure of Ni/GDC anodes, as compared the inhibiting effect of impregnation of Pd or GDC nanoparticles separately.