Preparation method and use of nitrogen-doped carbon-surface-loaded mononuclear metal catalyst

A metal catalyst, surface-loaded technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as catalyst problems, and achieve the effect of high stability and methanol resistance

Pending Publication Date: 2017-05-31
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of commercial application of fuel cells, one of the biggest problems encountered is the catalyst for the cathode oxygen reduction reaction.

Method used

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  • Preparation method and use of nitrogen-doped carbon-surface-loaded mononuclear metal catalyst
  • Preparation method and use of nitrogen-doped carbon-surface-loaded mononuclear metal catalyst
  • Preparation method and use of nitrogen-doped carbon-surface-loaded mononuclear metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Catalyst preparation

[0027] a, impregnation method: loading ferric chloride on the surface of 1g porous silica;

[0028] b. Dry the silicon dioxide impregnated with ferric chloride in step a at a temperature of 110° C. and disperse it in a mixed solution of 8.7 g of ethylenediamine and carbon tetrachloride, and reflux at a temperature of 90° C. for 6 hours to obtain a mixture;

[0029] c. After roasting the mixture obtained in step b at a temperature of 900°C in a nitrogen atmosphere for 3 hours, remove the silica with 8% hydrofluoric acid, wash and dry, and obtain a mononuclear dispersed nitrogen complex supported on the surface of nitrogen-doped carbon Iron catalyst (Fe / NC-X, X represents the iron percentage content of silica load), the X-ray synchrotron radiation result of the product obtained sees figure 1 , X-ray Photoelectron Spectroscopy see figure 2 .

[0030] Electrochemical performance test

[0031] Weigh 5 mg of the catalyst powder obtained in Example ...

Embodiment 2

[0034] Catalyst preparation

[0035] a, impregnation method: support copper chloride on the surface of 1g silica nanoparticles (Cu loading is 10%);

[0036] b. The silicon dioxide nanoparticles impregnated with copper chloride in step a were dried at a temperature of 110° C., dispersed in 8.7 g of ethylenediamine and carbon tetrachloride mixed solution, and refluxed at a temperature of 90° C. for 6 hours to obtain a mixture;

[0037] c. After roasting the mixture obtained in step b at a temperature of 900° C. for 3 hours in a nitrogen atmosphere, remove silicon dioxide with 8% hydrofluoric acid, and use FeCl 3 solution to remove Cu nanoparticles;

[0038] d. After washing and drying the product obtained in step c, a nitrogen-doped carbon (NC) surface-supported mononuclear dispersed nitrogen-coordinated copper catalyst (Cu / NC-10) is obtained.

[0039] Electrochemical performance test

[0040]Weigh 5 mg of the catalyst powder obtained in Example 2, and disperse it in 500 uL o...

Embodiment 3

[0043] Catalyst preparation

[0044] a, impregnation method: loading cobalt chloride (Co loading is 10%) on the surface of 0.5g porous silica;

[0045] b. The porous silica impregnated with metal cobalt chloride in step a was dried at a temperature of 110° C., dispersed in 8.7 g of ethylenediamine and carbon tetrachloride mixture, and refluxed at a temperature of 90° C. for 6 hours to obtain a mixture;

[0046] c. Calcining the mixture obtained in step b at a temperature of 900° C. for 3 h in a nitrogen atmosphere, and removing silicon dioxide with a concentration of 8% hydrofluoric acid;

[0047] d. After washing and drying the product obtained in step c, a nitrogen-doped carbon (NC) surface-supported mononuclear dispersed nitrogen-coordinated cobalt catalyst (Co / NC-10) is obtained.

[0048] Electrochemical performance test

[0049] Weigh 5 mg of the catalyst powder obtained in Example 3, and disperse it in 500 uL of isopropanol aqueous solution containing 0.05% naphthol so...

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Abstract

The invention discloses a preparation method and a use of a nitrogen-doped carbon-surface-loaded mononuclear metal catalyst. The preparation method comprises the steps of loading transitional metal salt on the surface of silicon dioxide by an impregnation method, drying and then dispersing into ethylenediamine and carbon tetrachloride solution, and performing refluxing treatment; and performing high-temperature roasting and carbonizing on an obtained black material in a protective atmosphere, and then removing silicon dioxide by hydrofluoric acid to obtain the nitrogen-doped carbon-surface-loaded mononuclear metal catalyst (M / NC, M is Fe, Co, Ni, Cu). The prepared catalyst is relatively large in specific surface area, and relatively high in activity and stability; according to the method, the components and the nanostructure are controllable, so that high probability is provided for a large-specific-surface-area and high-durability oxygen reduction electro-catalytic material; the method is simple and easy to implement, and the cost is low; and the catalyst represents extremely high catalytic performance in an electrochemical oxygen reduction reaction, and has high industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a mononuclear metal catalyst supported on the surface of nitrogen-doped carbon. Background technique [0002] The energy issue is one of the biggest issues in the 21st century and an important material basis for economic growth and social development. There are two main ways to deal with the energy crisis and environmental problems caused by the consumption of traditional fossil fuels: one is to improve the utilization efficiency of fossil fuels, delay the time of fuel depletion, and alleviate the energy shortage in the short term; the other is to explore and develop renewable energy technologies, from Basically remove dependence on fossil fuels. With the second industrial revolution, mankind has entered the era of electrification, and the integration and utilization of electric energy is particularly critical. With the increase of population and the development of economy, the demand f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96
CPCH01M4/88H01M4/96Y02E60/50
Inventor 胡广志沈行加夏木西卡玛尔·买买提覃丹凤
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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