▎ 摘　　要

NOVELTY - Graphene/carbon nanotube frame-wrapped iron carbide catalyst with molecular structure iron carbide-nitrogen-fluorine-graphitized multi walled carbon nanotubes comprises 'nano-sieve' graphene and 'stripy' carbon nanotubes as the outer frame, and the metal phase iron carbide is wrapped in the graphene/carbon nanotube frame, where graphene/carbon nanotube frame nitrogen/ fluorine double doped and rich in edge defect sites. USE - The graphene/carbon nanotube frame-wrapped iron carbide catalyst is useful as fuel cell, metal air battery and electrolyzed water oxygen electrocatalyst (all claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing a graphene/carbon nanotube frame-wrapped iron carbide catalyst, comprising (i) mixing melamine, polyvinylidene difluoride and iron(II) acetateare uniformly to prepare a catalyst precursor, where the mass ratio of iron(II) acetate and polyvinylidene difluoride is 0.2-2:1 and the mass ratio of melamine and polyvinylidene difluoride is 0.5-10:1; (ii) calcining catalyst precursor obtained under the protection of inert gas at 600-1200 degrees C at 2-10 degrees C/minute for 0.5-6 h; (iii) soaking product obtained in step (ii) in acid, washing the acid-washed product to neutrality and drying, where concentration of the acid is 0.5-3 mol/liter and pickling at 30-100 degrees C for 1-48 h; and (iv) carrying out second calcination for product obtained in the step (iii) at 600-1200 degrees C at 2-10 degrees C/min for 0.5-6 hours.