Effects of Anode Material and Fuel on Anodic Reaction of Solid Oxide Fuel Cells

Anodic properties of solid oxide fuel cells have been evaluated for several anode/electrolyte systems. Anodic over‐voltage of metal/yttria‐stabilized zirconia (YSZ) interface was related with metal‐oxygen bonding strength and was the smallest for the Ni anode in the present study. The anodic polarization conductivity of Ni‐YSZ cermet/YSZ electrolyte interface strongly depended on oxygen partial pressure, , in fuel, but was independent of the kind of fuel ( , , and ). The activation of oxygen ion appears to be the rate limiting step in the overall reaction. The overvoltages of Ni/ and Pt/samaria‐doped ceria (SDC) were very small as compared with those of Ni/ and Pt/YSZ. The anodic properties were also influenced by the oxide material mixed with Ni as a cermet component. The sequence of anodic polarization conductivities of Ni‐oxide cermet systems was .