ANODE FOR A HIGH-TEMPERATURE FUEL CELL AND PRODUCTION THEREOF

摘要

The substrate-supported anode for a high-temperature fuel cell, comprises 3-layer anode laminate (AI, A2, A3) on a metal substrate (S), where the individual layers of the anode laminate each comprise yttrium-oxide-stabilized zirconium dioxide (YSZ) and nickel, a metallic substrate made of chromium based alloy with a chromium content of more than 65 wt.% or a ferritic FeCrMx alloy with a chromium content of 20-30 wt.% and with Mx = an element or an oxide of the group of rare earth metal such as scandium, titanium, aluminum, manganese, molybdenum or cobalt, and a diffusion barrier (D). The substrate-supported anode for a high-temperature fuel cell, comprises 3-layer anode laminate (AI, A2, A3) on a metal substrate (S), where the individual layers of the anode laminate each comprise yttrium-oxide-stabilized zirconium dioxide (YSZ) and nickel, a metallic substrate made of chromium based alloy with a chromium content of more than 65 wt.% or a ferritic FeCrMx alloy with a chromium content of 20-30 wt.% and with Mx = an element or an oxide of the group of rare earth metal such as scandium, titanium, aluminum, manganese, molybdenum or cobalt, and a diffusion barrier (D) arranged between the metallic substrate and the first layer of the anode laminate. 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 rootmean- square roughness Rq of less than 4 mu m. The metallic substrate has an average grain size of 20-50 mu m. The last layer of the anode laminate has an average grain size of less than 4 mu m in the nickel phase or an overall average grain size of less than 1.5 mu m. The first layer of the anode laminate has an average grain size of 4-15 mu m in the nickel phase or overall average grain size of 1-8 mu m. The second layer of the anode laminate has an average grain size of 2-7 mu m in the nickel phase or overall average grain size of 0.5-4 mu m. An independent claim is included for a method for producing a substrate-supported anode for a high-temperature fuel cell.