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

A technology of transition metals and carbon materials, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex preparation process, unsuitable for large-scale industrialization, high preparation environment requirements, etc., and achieve simple design process and easy industrialization Achieving, low-cost effect

Active Publication Date: 2019-08-20
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 g

Method used

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

Examples

Experimental program
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Embodiment 1

[0037] When the transition metal is cobalt and the carbonization temperature is 950°C, it is a one-step carbonization preparation method of a carbon material with nitrogen, fluorine and transition metal co-doped graphene structure.

[0038] Step 1, the mixing of raw materials, with the mass ratio of melamine powder, polytetrafluoroethylene powder and metal salt cobalt acetate meeting 1:1.5:0.002, weigh 2.0 g of melamine powder and 3.0 g of polytetrafluoroethylene powder, add 2 mL of 0.035 The ethanolic solution of cobalt acetate of M was mixed and ground, and after being manually ground for 1 hour to dry, a uniformly mixed powder sample was obtained;

[0039] Step 2, one-step carbonization method, put the homogeneous powder sample obtained in step 1 under a nitrogen atmosphere for carbonization, at a heating rate of 5°C / min, from room temperature to 950°C, and then keep warm for carbonization for 1 hour.

[0040] For the ORR performance of this embodiment, see figure 1 , pola...

Embodiment 2

[0049] When the transition metal is cobalt and the carbonization temperature is 950°C, a one-step carbonization preparation method of a carbon material with nitrogen, fluorine and transition metal co-doped graphene structure.

[0050] The steps not specified in the specific steps are the same as the preparation method described in Example 1, except that the mass ratio of melamine powder, polytetrafluoroethylene powder and metal salt in step 1 satisfies 1:1.5:0.004, adding 4 mL of 0.035 M cobalt acetate in ethanol.

[0051] For the ORR performance of this embodiment, see figure 1 , polarization curve 1.

[0052] The results of the oxygen reduction performance characterization of embodiment 1, comparative example and embodiment 2 are as follows figure 1 shown by figure 1 Concluded as follow:

[0053] 1. Doping transition metal elements can significantly improve the oxygen reduction catalytic performance of the material;

[0054] 2. The content of different transition metal ...

Embodiment 3

[0058] When the transition metal is cobalt and the carbonization temperature is 900°C, it is a one-step carbonization preparation method of a carbon material with nitrogen, fluorine and transition metal co-doped graphene structure.

[0059] The steps not specifically described in the specific steps are the same as the preparation method described in Example 1, except that the temperature in Step 2 is raised to 900°C.

[0060] For the ORR performance of this embodiment, see figure 2 , polarization curve 2.

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/90Y02E60/50
Inventor 彭洪亮段典成胡芳马姣君高伟徐芬孙立贤
Owner GUILIN UNIV OF ELECTRONIC TECH
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