Carbon material with nitrogen, fluorine and transition metal co-doped graphene structure and one-step carbonization preparation method thereof

Abstract

The invention provides a carbon material with a nitrogen, fluorine and transition metal co-doped graphene structure. Melamine, polytetrafluoroethylene and a metal salt are taken as raw materials for mixing and uniform grinding to prepare and obtain a nitrogen, fluorine and transition metal co-doped carbon material by employing a one-step carbonization method. The carbon material shows a graphene or graphene-like structure; the nitrogen, fluorine and metal elements are uniformly distributed, and the carbon material has excellent oxygen reduction and oxygen evolution performances. The one-step carbonization preparation method comprises the following steps of: 1) mixing of the raw materials; and 2) one-step carbonization method. The carbon material provided by the invention has excellent oxygen reduction and oxygen evolution performances. Besides, the excellent oxygen reduction and oxygen evolution performances of the material can be improved through regulation of the synergistic effect among the nitrogen, the fluorine and transition metal. The one-step carbonization method is good in repeatability, simple in process and easy to operate. The carbon material has wide application prospects in the fuel cell and metal-air cell electrode catalysis and the direction of functional carbon materials.

Description

technical field [0001] The invention relates to the field of functional carbon materials, in particular to a method for preparing carbon materials with a graphene structure co-doped with nitrogen, fluorine and transition metals. Background technique [0002] At present, fossil fuels are still our most mainstream energy sources, and their traditional energy utilization methods have two major drawbacks: low efficiency and high pollution. These ills have a great negative impact on the global ecology and environment. In order to adapt to the development needs of the new era, the era urgently needs new energy sources and new energy utilization methods. Hydrogen energy, as an ideal clean energy, has received extensive attention worldwide in recent years. The hydrogen-oxygen fuel cell can directly convert hydrogen energy into electrical energy through an electrochemical reaction, and its product is only water; it is not restricted by the Carnot cycle, and has the advantages of hi...

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Problems solved by technology

The non-precious metal catalysts prepared by the above methods all have good oxygen reduction catalytic activity, but they all have the following disadvantages: the preparation process is complicated, the preparation environment is high, and the equipment required is relatively complicated. These factors bring about high cost and are not suitable for large-scale industrialization. and other defects

However, carbon materials with a graphene structure have been prepared by co-doping nitrogen and fluorine, two strongly electronegative heteroatoms and transition metals, and one-step carbonization. Until now, no related reports have been retrieved.

The main reason is that it is difficult to prepare graphene co-doped with nitrogen, fluorine heteroatoms and transition metals; it is even more difficult to carbonize carbon materials with a graphene structure in one step

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