Electrode Behavior of Ni/GDC and Pd-Impregnated Ni/GDC Cermets in H_2/H_2S Fuels of Solid Oxide Fuel Cells

摘要

The effect of H_2S on the hydrogen oxidation on Ni/gadolinia doped ceria (Ni/GDC) anodes with/without Pd-impregnation was investigated using the electrochemical impedance spectroscopy (EIS) and galvanostatic polarization techniques at 800°C. The polarization performance of Ni/GDC anodes degraded rapidly and the presence of 100 ppm H_2S in H_2 fuel causes structural damage to the Ni/GDC anodes after polarized at 200 mA/cm~2 for 55 h. The infiltrated Pd nanoparticles significantly reduce the electrode polarization resistance, and promote the stability of the Ni/GDC anodes. The impregnated Pd nanoparticles on the surface of Ni/GDC anodes significantly reduced the structural damage and modification effect of H_2S on the Ni and GDC particles of the anodes.