Improved anode / electrolyte structure for a solid oxide electrochemical cell and method of making the structure

摘要

Novel improved anode / electrolyte structures for solid oxide electrochemical cells include: (a) niobium doped strontium titanate, vanadium doped strontium titanate, tantalum doped titanium An anode comprising a backbone of an electronically conductive perovskite oxide selected from the group consisting of strontium acid and mixtures thereof, (b) a scandia and yttria stabilized zirconium oxide electrolyte, and (c) between the anode and the electrolyte A metal and / or ceramic electrocatalyst in the form of an intermediate layer introduced at the interface. The assembly is first sintered in a reducing gas mixture at a given temperature and then at a lower temperature. The metal and / or ceramic interlayer is dispersed in the electrolyte / anode backbone junction. These heat treatments disperse the metal and / or ceramic interlayer at the electrolyte / anode backbone junction. The structure comprises: (a) depositing a ceramic intermediate layer on one side of the electrolyte; (b) optionally applying a metal intermediate layer thereon; (c) step (a) and Repeating (b), (d) applying the selected anode backbone layer onto the applied intermediate layer electrolyte, (e) heating the crude assembly to about 1200 ° C. in air And then heating the sintered assembly to about 1000 ° C. in H2 / N2 for up to 5 hours, and (f) The electrocatalyst is introduced into the anode backbone by impregnating the sintered assembly and further heat treating the sintered assembly at a temperature of about 350-650 ° C. in air. Is the manufacturing process, by a method comprising the.