The Preparation and Properties of Composite Anode Materials CuXCoYO-SDC for Solid Oxide Fuel Cell

摘要

In order to find out anode materials matching with mid-temperature electrolyte,CuXCoYO and SDC powders were prepared by sol-gel-EDTA method,and CuXCoYO-SDC was prepared by pressing.TG curve reflects that quality has no change after 800.Therefore,°C the temperature of pre-burning is above 800°C.Because the melting point of copper oxide is 1038°C,the eventual temperature of sintering is set to be 1000°C.The powders are characterized by XRD.The result shows that CuO and Co2O3 have formed new intersoluble material of CuXCoYO,meanwhile,CuXCoYO and SDC do not react with each other and keep the single phase respectively.SEM figure of CuXCoYO-SDC composite anode after heat treatment in air atmosphere at 1000 °C shows that SDC scattered in CuXCoYO has not form a phase so that the conclusion of XRD before is confirmed.SEM figure of CuXCoYO-SDC anode material after reduction shows that the sintered anode has formed big pores and high porosity among particles and is helpful for fast gas spread to guarantee enough three-phase reaction interfaces.SDC particles take the catalytic role and transmit electrons and ions.This structure contributes to high electrical conductivity and catalysis for the anode material.The conductivity behaviors of CuXCoYO are tested.The results show that conductivity remains high at mid-temperature.The reduced Cu0.9Co0.1OSDC has the highest conductivity of 1310.1 S/cm at 500°C.