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Preparation method for ordered mesoporous non-noble metal-nitrogen-graphitized carbon material

A non-precious metal and graphitized carbon technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of reducing the optimal amount of metal used, reducing the overall nitrogen density of materials, and accessing active sites Reduce other problems, achieve superior catalytic stability and methanol resistance, high nitrogen density, and good electrical conductivity

Inactive Publication Date: 2012-10-17
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of the carrier inevitably confines the metal-nitrogen-carbon species to the surface of the material, limits the loading amount of the catalytically active metal-nitrogen-carbon material, reduces the overall nitrogen density of the material, and reduces the optimal amount of metal used (optimum The amount is generally only 2-5%); and the uneven loading of various precursors may directly lead to the reduction of the number of active sites generated, and the uneven dispersion of metal-nitrogen-carbon deposition will also indirectly cause the reduction of accessible active sites

Method used

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  • Preparation method for ordered mesoporous non-noble metal-nitrogen-graphitized carbon material
  • Preparation method for ordered mesoporous non-noble metal-nitrogen-graphitized carbon material
  • Preparation method for ordered mesoporous non-noble metal-nitrogen-graphitized carbon material

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Experimental program
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Effect test

Embodiment 1

[0031] a. Synthesis of filling materials

[0032] Add 5g of o-phenanthroline into 60ml of ethanol, add 1.57g of cobalt acetate under stirring, stir and dissolve, add 1g of mesoporous silica SBA-15, and continue stirring at room temperature until dry. Then, it was dried at a constant temperature of 60°C.

[0033] b. High temperature roasting of filling materials

[0034] The dry filling material is placed in a quartz tube, heated in a high-purity nitrogen (40ml / min) atmosphere at 500°C, and kept for 6 hours. The black powder is the carbonized filling material.

[0035] c. Removal of the mesoporous silica template

[0036] The carbonized filling material was stirred with 50 mL of 25% hydrofluoric acid solution for 10 h, washed with deionized water, and dried to obtain an ordered mesoporous non-noble metal-nitrogen-graphitized carbon material.

Embodiment 2

[0038] a. Synthesis of filling materials

[0039] Add 0.5g of o-phenanthroline to 30ml of ethanol, add 0.196g of cobalt acetate under stirring, stir to dissolve, add 1g of mesoporous silica SBA-15, and continue stirring at room temperature until dry. Then, it was dried at a constant temperature of 60°C.

[0040] b. High temperature roasting of filling materials

[0041] The dry filling material is placed in a quartz tube, heated in a high-purity nitrogen (40ml / min) atmosphere at 700°C, and kept for 2 hours. The black powder is the carbonized filling material.

[0042] c. Removal of the mesoporous silica template

[0043] The carbonized filling material was stirred with 30 mL of 25% hydrofluoric acid solution for a certain period of time for 20 h, washed with deionized water, and dried to obtain an ordered mesoporous non-noble metal-nitrogen-graphitized carbon material.

Embodiment 3

[0045] a. Synthesis of filling materials

[0046] Add 1g of o-phenanthroline into 60ml of ethanol, add 1.26g of cobalt acetate under stirring, stir and dissolve, add 1g of mesoporous silica SBA-15, and continue stirring at room temperature until dry. Then, it was dried at a constant temperature of 60°C.

[0047] b. High temperature roasting of filling materials

[0048] The dry filling material is placed in a quartz tube, heated in a high-purity nitrogen (40ml / min) atmosphere at 550°C, and kept for 5 hours. The black powder is the carbonized filling material.

[0049] c. Removal of the mesoporous silica template

[0050] The carbonized filling material was stirred with 40 mL of 25% hydrofluoric acid solution for 24 hours, washed with deionized water, and dried to obtain an ordered mesoporous non-noble metal-nitrogen-graphitized carbon material.

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Abstract

The invention discloses a preparation method for an ordered mesoporous non-noble metal-nitrogen-graphitized carbon material. According to the method, mesoporous silicon oxide SBA-15 is used as a hard template, the micromolecular compounds of phenanthroline and metal acetate are used as precursors, and then the ordered mesoporous non-noble metal-nitrogen-graphitized carbon material is obtained through high temperature roasting and nano-pouring of the hard template. The material prepared in the invention, as a whole, has high nitrogen density and high metal content while maintaining a high specific surface area and good dispersibility; and compared with traditional cathode materials of a fuel cell, the ordered mesoporous non-noble metal-nitrogen-graphitized carbon material prepared in the invention has the advantages of good catalytic performance, low cost, good stability, prevention of a cross effect of a direct methanol fuel cell and a good business prospect.

Description

technical field [0001] The invention relates to the synthesis technology of mesoporous materials and the field of electrocatalysts for fuel cells. Specifically, a small organic molecule and a simple metal acetate are used as precursors, and mesoporous silicon oxide is used as a hard template. Porous non-noble metal-nitrogen-graphitized carbon materials approach. Background technique [0002] In order to solve the growing contradiction between economic development, energy shortage and environmental pollution, it has become a very urgent task to develop clean, efficient and sustainable new energy power technology. Fuel cell is such a brand-new efficient and clean power generation method which is the most competitive in the 21st century. Proton exchange membrane fuel cell is one of the low-carbon, environment-friendly new energy sources that have wide application prospects in portable power sources, automobiles and other vehicles, or distributed power stations. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 单永奎孔莹莹
Owner EAST CHINA NORMAL UNIV
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