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Development of Functional SOFC Anode

For anode-supported planar SOFC, the most widely accepted anode material is nickel-8mol% yttria stabilized zirconia (Ni-YSZ) cermet. For the required electrical conductivity during intermediate temperature SOFC operation (similar to 800 degrees C), conventionally 35-40vol.% Ni is used. Reduction of nickel content not only solves nickel coarsening problem during long-term SOFC operation but also makes thermal expansion coefficient much closer to YSZ. In this investigation, a novel electroless technique is employed to prepare uniform coating of metallic Ni onto YSZ to make core-shell anode cermet structure. Compared to conventionally prepared anodes (similar to 35vol.% Ni), in this functional anode, percolation threshold is lowered down to similar to 20vol.% to achieve almost same electrical conductivity (sigma(800 degrees C) similar to 150 S cm(-1)). However, the properties of these cermets depend strongly on several processing conditions like particle size of YSZ powders, sensitization process, electroless bath composition and deposition temperature. A simple adsorption kinetic model for sensitization process is proposed.