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Preparation method of 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet

A technology of catalysts and nanosheets, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as poor stability, limitations, and high prices, and achieve high stability and strong innovation Effect

Active Publication Date: 2019-05-10
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for a long time, the efficiency of these devices has been limited by the intrinsically slow oxygen reduction reaction kinetics of the cathode, which also poses a great challenge to the development of efficient oxygen reduction reaction catalysts.
At present, the noble metal Pt and its alloys have the most efficient electrocatalytic performance for the oxygen reduction reaction, but its low earth abundance, high price, and poor stability greatly limit its large-scale application.

Method used

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  • Preparation method of 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet
  • Preparation method of 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet
  • Preparation method of 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet

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Embodiment 1

[0028] In this example, graphene oxide was used as a template to construct 2D-Fe 3 o 4 @FeNC - T two-dimensional composite materials.

[0029] The details of the solution will be described in detail below in conjunction with specific embodiments and accompanying drawings, as follows.

[0030] (1) Weigh a certain mass of graphene oxide and place it in a round bottom flask, add a certain amount of deionized water, ultrasonically disperse for 15 minutes, and then magnetically stir for 15 minutes to obtain a uniform dispersion of 0.25 mg / mL.

[0031] (2) Add a certain amount of pyrrole monomer into the above solution, and continue stirring for 15 minutes, wherein the weight ratio of the pyrrole monomer to graphene oxide is 20:1.

[0032] (3) Weigh ferric chloride and dissolve it in deionized water, and add it dropwise to the above solution. After 24 hours of polymerization, filter with suction and wash with deionized water to obtain a graphene-polypyrrole two-dimensional compos...

Embodiment 2

[0039] (1) Weigh a certain amount of graphene oxide into a round bottom flask, add a certain amount of deionized water, ultrasonically disperse for 15 minutes, and then magnetically stir for 15 minutes to obtain a uniform dispersion of 0.1 mg / mL.

[0040] (2) Add a certain amount of pyrrole monomer into the above solution, and continue stirring for 15 minutes, wherein the weight ratio of the pyrrole monomer to graphene oxide is 10:1.

[0041] (3) Weigh ferric chloride and dissolve it in deionized water, and add it dropwise to the above solution. After 24 hours of polymerization, filter with suction and wash with deionized water to obtain a graphene-polypyrrole two-dimensional composite. In the polymerization process, pyrrole single The weight ratio of body to ferric chloride is 1:5.

[0042](4) Disperse the graphene-polypyrrole two-dimensional composite into an ethanol solution, add a certain amount of ferric chloride, and stir at 60°C for 60 minutes, and then spin dry. In the...

Embodiment 3

[0048] (1) Weigh a certain mass of graphene oxide and place it in a round bottom flask, add a certain amount of deionized water, ultrasonically disperse for 15 minutes, and then magnetically stir for 15 minutes to obtain a uniform dispersion of 0.5 mg / mL.

[0049] (2) Add a certain amount of pyrrole monomer into the above solution, and continue stirring for 15 minutes, wherein the weight ratio of the pyrrole monomer to graphene oxide is 30:1.

[0050] (3) Weigh ferric chloride and dissolve it in deionized water, and add it dropwise to the above solution. After 24 hours of polymerization, filter with suction and wash with deionized water to obtain a graphene-polypyrrole two-dimensional composite. In the polymerization process, pyrrole single The weight ratio of body to ferric chloride is 1:6.

[0051] (4) Disperse the graphene-polypyrrole two-dimensional composite into an ethanol solution, add a certain amount of ferric chloride, and stir at 60°C for 60 minutes, and then spin d...

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Abstract

A preparation method of a 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet comprises the steps of firstly dispersing graphene oxide in water, then adding a pyrrole monomer and an oxidant ferric chloride to obtain a graphene-polypyrrole two-dimensional polymer, and adding a proper amount of ferric chloride to the obtained two-dimensional polymer. A two-dimensional carbon material is obtained by pyrolyzing a two-dimensional polymer and ferric chloride mixture, is activated by adding potassium hydroxide, and is subjected to sulfuric acid pickling and secondary carbonization to obtain the 2D oxygen reduction catalyst Fe3O4@FeNC nanosheet. The 2D-Fe3O4@FeNC nanosheet prepared by the invention has high oxygen reduction activity, high methanol tolerance and high stability, is an ideal oxygen reduction catalyst, and is potentially applied to energy storage and conversion devices.

Description

technical field [0001] The invention belongs to the field of new materials and electrochemical catalysis, in particular to a two-dimensional (2D) oxygen reduction catalyst Fe 3 o 4 Preparation method of @FeNC nanosheets. Background technique [0002] The oxygen reduction reaction is a central reaction in some energy conversion and storage devices such as metal-air batteries and fuel cells. However, for a long time, the efficiency of these devices has been limited by the inherently slow oxygen reduction reaction kinetics of the cathode, which also poses a great challenge to develop efficient oxygen reduction reaction catalysts. At present, the noble metal Pt and its alloys have the most efficient electrocatalytic performance for oxygen reduction reaction, but its low earth abundance, high price, and poor stability greatly limit its large-scale application. Therefore, it becomes important to invest a lot of research in the development of noble metal-free carbon-based oxygen...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 袁凯李龙彬陈义旺胡婷谈利承
Owner NANCHANG UNIV
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