Iron trioxide/nitrogen-doped carbon electrode material, preparation method thereof and application of iron trioxide/nitrogen-doped carbon electrode material in supercapacitor

The invention provides a preparation method of an iron trioxide/nitrogen-doped carbon electrode material, and belongs to the technical field of electrode materials. The preparation method of the ferric oxide/nitrogen-doped carbon electrode material provided by the invention comprises the following steps: mixing a biomass carbon source with a nitrogen source, an iron salt and water for modification to obtain modified biomass carbon; roasting the modified biomass carbon to obtain roasted powder; and carrying out secondary carbonization on the roasted powder to obtain the ferric oxide/nitrogen-doped carbon electrode material. By introducing a nitrogen source and utilizing nitrogen atoms to dope biomass carbon, more defects, disordered structures and active sites are caused at high temperature, and the specific surface area is increased; an iron source is introduced, so that Fe2O3 is coated by nitrogen-doped carbon to form nanoparticles which are dispersed on the surface of a carbon block to provide pseudocapacit