Preparation of Fe-Co-N three-element co-doping three-dimensional graphene with catalytic synergistic effect

Abstract

The invention relates to a simple preparation method of Fe (ferrous), Co (cobalt) and N (nitrogen) three-element co-doping three-dimensional graphene with catalytic synergistic effect. The preparation method comprises the following steps of enabling soluble fully-aromatic PBI (polybenzimidazole) to react with a ferrous salt and cobalt salt mixing solution; firstly, preparing a complex of PBI, ferrous ions and cobalt ions; adding a nanometer template agent into the reaction mixing liquid; regularly arranging the complex at the surface of the template agent; pyrolyzing, removing a template, and the like, so as to prepare the Fe-Co-N three-element co-doping three-dimensional graphene. The PBI is selected from fully-aromatic macromolecules, such as ABPBI and mPBI, and the viscosity average molecular weigh is 20,000 to 40,000; the molar ratio of ferrous salt and cobalt salt is 1:2 to 2:1; the mass ratio of PBI and ferrous salt and cobalt salt mixture is 1:2 to 2:1; the template agent is selected from nanometer magnesium oxide, ferric oxide and ferric hydroxide nanoparticles; the particle size of the template agent is 5 to 50nm; the mass ratio of PBI and template agent is 3:1 to 1:3; the pyrolysis temperature is 700 to 1000 DEG C; the Fe-Co-N three-element co-doping three-dimensional graphene can be applied to the fields of redox reaction catalysts, fuel batteries, metal air battery redox catalysts, water electrolysis separation catalysts, supercapacitors and the like.

Description

technical field [0001] Belonging to the field of nanomaterial preparation, it is used in redox reaction catalysts in chemical production, fuel cells in the field of clean energy, cathode catalysts for metal-air batteries, electrolytic water catalysts, lithium-ion battery materials, supercapacitor electrode materials and electrochemical sensors, etc. . Background technique [0002] Graphene is a nanomaterial with a regular hexagonal extended two-dimensional grid structure composed of carbon atoms. Due to its excellent performance and multiple potential applications, it has become a research hotspot that has attracted widespread attention today (Kim K S, et al. Nature (Nature), 2009, 457: 706). However, in the macroscopic world, two-dimensional graphene is very easy to overlap each other layer by layer to form a graphite structure, thus losing its excellent performance. Therefore, the preparation and performance research of three-dimensional graphene has become a research ho...

AI Technical Summary

Problems solved by technology

The present invention differs from metal-nitrogen-carbon clusters prepared by pyrolysis of simple nitrogen-containing organic compounds and transition metal complexes or nitrogen-containing polymers, such as urea resin, melamine resin, etc., and transition metal mixtures in that metal-nitrogen-carbon clusters The atomic cluster is not a graphene structure and has no large π effect, so the catalytic performance is not high, and its metal is easily removed by acid, so the durability is not good enough, especially because the metal-nitrogen-carbon cluster is not a porous structure and its mass transfer effect not good