Abstract
For anode-supported planar SOFC, the most widely accepted anode material is nickel-8 mol% yttria stabilized zirconia (Ni- YSZ) cermet. For the required electrical conductivity during intermediate temperature SOFC operation (~800oC), conventionally 35-40 vol% Ni is used. Reduction of nickel content solves not only 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 (~35 vol% Ni), in this functional anode, percolation threshold is lowered down to ~20 vol% to achieve almost same electrical conductivity (σ800oC ~150 Scm-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.
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