Nickel-cermet anode for fuel cells with the LSGM electrolyte

摘要

The effect of some technological parameters (firing temperature, thickness of a interphase layer Z C made of solid electrolyte Ce0.82Gd0.18O1.91 (GDC), the GDC electrolyte amount in nickel-cermet) on the electrochemical and electric properties of a nickel-cermet (Ni-GDC) anode intended for fuel cells with the La0.88Sr0.12Ga0.82Mg0.18O2.85(LSGM) electrolyte is studied. The polarization resistance of such an electrode is shown to hardly depend on the thickness of the interphase layer (4.5-23.5 mu m) and the GDC electrolyte amount in nickel-cermet and to increase with the anode firing temperature. It is established that the contact resistance is concentrated in cells with the developed nickel-cermet electrode at the GDC/LSGM interface. At a temperature of 700 degrees C the developed anodes may ensure a current density of I A cm(-2) at an overvoltage of less than 100 mV when using both moist hydrogen and a methane-oxygen mixture as the fuel.