ANODE FOR A HIGH-TEMPERATURE FUEL CELL AND PRODUCTION THEREOF

摘要

The invention relates to a substrate-supported anode for a high-temperature fuel cell, comprising an at least 3-layer anode laminate (A1, A2, A3) on a metal substrate. The individual layers of the anode laminate each comprise yttrium-oxide-stabilized zirconium dioxide (YSZ) and nickel, wherein the average grain size of the nickel decreases from layer to layer with increasing distance from the substrate. The last layer of the anode laminate, which is intended for contact with the electrolyte, has a root-mean-square roughness R q , also described as average surface roughness in the context of the invention, of less than 4 µm. The overall average pore size of said layer is generally between 0.3 and 1.5 µm. In the method for producing such a substrate-supported anode for a high-temperature fuel cell, starting powders having a bimodal grain size distribution of yttrium-oxide-stabilized zirconium dioxide (YSZ) and nickel-containing powder are used at least for the first and second layers of the anode laminate. The average grain size of the nickel-containing powder used is reduced from layer to layer so that the average grain size in the last layer of the anode laminate is advantageously no greater than 0.5 µm.