Porous GDC Scaffold Anodes for Lower Temperature, Hydrocarbon-Fueled Solid Oxide Fuel Cells

Porous gadolinia doped ceria (GDC) anode supports were employed to alleviate thermal and chemical expansion mismatches between the anode and GDC electrolyte. The ceramic support also prevents structural damage caused by oxidation of state-of-the-art nickel cermet anodes. Nickel metal was infiltrated into the porous freestanding scaffold as a catalyst and electronic conductor. Cells based on these anodes were characterized by current-voltage measurements and electrochemical impedance spectroscopy to determine their polarizations, maximum power densities, and stability when using hydrogen or methane fuel. Ohmic polarization was similar to a cermet anode, despite similar to 80% smaller metal loading. Current-voltage plots showed no appreciable degradation in performance in long-term methane operation or after thermal cycling, indicating this anode is suitable for use with hydrocarbon fuels.