Method for preparing solid oxide fuel cell cathode materials by microwave calcination and application thereof

Abstract

The present invention discloses a method for preparing solid oxide fuel cell cathode materials with high specific surface area by segmented microwave calcination. The prepared cathode material is a double perovskite structure with the molecular formula Sr2Fe1.5(MoxScy)O6, where x + y = 0.5 and x ranges from 0.2 to 0.3. The preparation process is as follows: first, raw materials such as Sc2O3, SrCO3, Fe(NO3)3, and (NH4)2MoO4 are added to deionized water and nitric acid solution, stirred and dissolved to form a mixed solution; then, citric acid and ethylenediaminetetraacetic acid are added to the mixed solution as complexing agents, stirred until dissolved, and ammonia water is added dropwise to adjust the pH to 8-10; subsequently, the solution is placed in a constant temperature environment of 60-80 degrees Celsius for stirring and evaporation to convert it into a gel, which is further dried and decomposed to obtain a precursor; the precursor is first pre-calcined in a muffle furnace at 600 degrees Celsius for 2-4 h, then transferred to a microwave sintering furnace, and calcined at 800-1200 degrees Celsius with a power of 1000 W for 10-30 min; finally, the material is naturally cooled and ground to obtain the cathode material. Tests show that when applied in a full cell at 700 degrees Celsius, the maximum power may reach 1323.1 milliwatt per square centimeter.

Images