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Preparing method for non-precious metal ion complexation Schiff base graphene catalyst

A non-noble metal and graphene technology, applied in the field of preparation of non-noble metal ion-complexed Schiff base graphene catalysts, can solve the problems of low catalytic activity, weak mass transfer inside the catalyst, poor conductivity between graphene layers, etc., to achieve The operation process is simple, the production cost is low, and the method is simple and easy to implement

Inactive Publication Date: 2015-10-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention aims at the shortcomings of existing graphene-based non-precious metal catalysts, such as low catalytic activity, weak internal mass transfer of the catalyst, and poor electrical conductivity between graphene layers, providing a non-noble metal ion complexed Schiff base graphene catalyst preparation method

Method used

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  • Preparing method for non-precious metal ion complexation Schiff base graphene catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Preparation of graphene oxide

[0033]Take by weighing 3 grams of graphite powder, join 600 milliliters of concentrated phosphoric acid: concentrated sulfuric acid volume ratio is in the mixed solution of 1: 9, after mixing uniformly, obtain graphite powder mixed solution; After above-mentioned graphite powder mixed solution is placed in ice-water bath, Slowly add 18 grams of potassium permanganate solid powder, stir and mix evenly to obtain a potassium permanganate graphite powder mixture; then raise the temperature of the potassium permanganate graphite powder mixture to 50°C, stir for 12 hours, and then slowly pour Excessive ice water to obtain a purple-green ice water solution; finally, slowly and continuously add hydrogen peroxide solution with a mass fraction of 30% to the above-mentioned purple-green ice water solution until the solution turns golden yellow and stop adding, after filtration, dilute hydrochloric acid and ultrapure After alternate washing with ...

Embodiment 2

[0041] Step (1) is the same as step (1) in Example 1.

[0042] (2) Preparation of aminated graphene

[0043] Graphene oxide: p-phenylenediamine mass ratio is 1: 140 and weighs the graphene oxide and p-phenylenediamine prepared by step (1); first disperses the graphene oxide prepared by step (1) in deionized water , forming a graphene oxide suspension with a mass concentration of 0.8 mg / ml; then adding p-phenylenediamine to the above-mentioned graphene oxide dispersion, and stirring at room temperature for 15 minutes to form a p-phenylenediamine graphene oxide suspension; then The above p-phenylenediamine graphene oxide suspension was heated to 80°C, stirred and refluxed for 4 hours; finally, aminated graphene was obtained after suction filtration, ethanol washing 4 times, and drying;

[0044] (3) Preparation of Schiff base graphene

[0045] According to the mass ratio of aminated graphene: melamine: salicylaldehyde 1: 4.9: 19.1, respectively weigh the aminated graphene, mela...

Embodiment 3

[0051] Step (1) is the same as step (1) in Example 1.

[0052] (2) Preparation of aminated graphene

[0053] Be that 1: 186 by graphene oxide: melamine mass ratio take the graphene oxide prepared by step (1) and melamine; First the graphene oxide prepared by step (1) is dispersed in deionized water to form a mass concentration of 1.2 mg / ml of graphene oxide suspension; then melamine was added to the above-mentioned graphene oxide dispersion, and stirred at room temperature for 20 minutes to form a melamine graphene oxide suspension; then the above-mentioned melamine graphene oxide suspension was heated to 100°C, Stir and reflux for 5 hours; finally obtain aminated graphene after suction filtration, washing with ethanol for 5 times, and drying;

[0054] (3) Preparation of Schiff base graphene

[0055] According to the mass ratio of aminated graphene: melamine: salicylaldehyde 1: 10: 39, take respectively the aminated graphene, melamine and salicylaldehyde prepared by step (2)...

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Abstract

The invention provides a preparing method for a non-precious metal ion complexation Schiff base graphene catalyst and belongs to the technical field of fuel batteries. The preparing method comprises the steps that firstly, amidogen functional groups are grafted to the edge flaw positions of a graphene sheet; secondly, the amidogen functional groups are converted into Schiff base functional groups through amine-aldehyde condensation; finally, complexation is carried out on non-precious metal ions, and the non-precious metal ion complexation Schiff base graphene catalyst of an adjustable three-dimensional stereostructure is obtained. According to the preparing method, the complexation action of the non-precious metal ions and the Schiff base is ingeniously used, a link is formed between layers of graphene, the three-dimensional cross-linked graphene catalyst stereostructure is formed, and the electron conduction capability between layers of the graphene and the mass transfer speed in the layers are increased; meanwhile, a large quantity of metal Schiff base complex catalytic activity sites are generated, concerted catalysis with the graphene is achieved, and the catalytic activity is improved. The operation is simple, industrialization production is easy, and the prepared catalyst can be widely applied to fuel batteries with proton exchange films as electrolytes.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a preparation method of a non-noble metal ion-complexed Schiff base graphene catalyst. Background technique [0002] Fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, and rapid start-up at room temperature, and are considered to be the most promising chemical power sources for electric vehicles and other civilian applications in the future. At present, the main fuel cell cathode catalysts are platinum-based catalysts, but their disadvantages such as high cost, lack of resources, and easy poisoning seriously restrict the development of fuel cells. Therefore, it is of great significance to develop a low-cost and high-performance non-noble metal catalyst for fuel cell cathode. [0003] A lot of research work has been done on the development of highly efficient non-precious metal fuel cell cathode catalysts at home and abroad. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J31/28
CPCB01J31/28H01M4/90Y02E60/50
Inventor 魏子栋靳文婷丁炜廖满生罗浩陈四国
Owner CHONGQING UNIV
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