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Preparation and application of non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst

A non-precious metal, electrocatalyst technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of a wide range of applications

Active Publication Date: 2019-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of amorphous carbon or graphene carbon-coated transition metal active sites, the obtained catalyst can only be used in alkaline systems, and the catalyst can only be used in alkaline systems, and the -2 In the alkaline electrolyte, the half-wave potential still differs from Pt / C by 34mV

Method used

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  • Preparation and application of non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst
  • Preparation and application of non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst
  • Preparation and application of non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Using MIL-101(Fe) as the precursor, first add 1.328g terephthalic acid and 2.168g to 394ml DMF to prepare 62.5mg FeCl 3 ·6H 2 O, after stirring and reacting at 150° C. for 24 hours in a single-necked flask, filter, centrifuge and dry the resulting precipitate to obtain about 0.8 g of light pink MIL-101(Fe) powder.

[0027] 2. Immerse the above-mentioned light pink powder in aniline monomer at a concentration of 0.12g / ml, stir at room temperature for 2 days, filter and wash with a small amount of ether, and dry in an oven at 60°C to obtain a khaki MIL-ANI (aniline) compound The product is about 0.9g.

[0028] 3. Dissolve the MIL-ANI complex in 1M HCl solution at a concentration of 0.04g / ml, and add 0.18g / ml ammonium persulfate / 1M HCl solution dropwise with stirring at a low temperature below 4°C until the solution becomes After dark green, the polymerization reaction was continued for 4 hours, filtered and washed with water until neutral, and dried to obtain about 0...

Embodiment 2

[0032] The difference between this example and Example 1 is that the immersion time of MIL-101(Fe) powder in the aniline monomer is 0.5 days (12 hours), and the polymerization time of aniline is 20 hours, and the conditions of the two pyrolysis are respectively 800°C for 2 hours and 1000°C for 1 hour. The resulting catalyst is designated C-MIL-PANI-2.

[0033] Figure 5 N for C-MIL-PANI-2 catalyst 2 According to the physical adsorption-desorption curve, the BET specific surface area is 862.826m 2 g -1 . Figure 6 It is the performance diagram of the full cell when C-MIL-PANI-2 is used as the cathode catalyst of the proton exchange membrane fuel cell. It can be seen that its highest power density can reach 150mW / cm 2 .

Embodiment 3

[0035] The difference between this example and Example 1 is that the self-made ZIF-8 white powder and MIL-101(Fe) powder are ground and mixed with the same amount of substances, and then impregnated in the aniline monomer together. The resulting catalyst is designated as C-MIL / ZIF-PANI. Wherein, the preparation method of ZIF-8 is as follows:

[0036] In a 250ml single-necked flask, add 125mL ethanol, 1.1900g Zn(NO 3 ) 2 ·6H 2 0 and 1.6405g 2-methylimidazole, stirred and reacted at room temperature for 24 hours, filtered and centrifuged, washed and dried to obtain about 0.4g of ZIF-8 white powder.

[0037] Figure 7 The performance diagram of the full cell when the C-MIL / ZIF-PANI prepared for Example 3 is used as the cathode catalyst of the proton exchange membrane fuel cell shows that the power density of the cell decreases to a certain extent as the operating time of the cell increases.

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Abstract

The invention relates to a preparation method of a non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst. Specifically, in a hydrochloric acid solution, a self-made or commercial non-noble metal organic framework material (MOF) is taken as a metal source and carbon source precursor under the condition of no surfactant; in-situ polymerization is carried out on the surface of the metal source and carbon source precursor to generate polyaniline (PANI); and pyrolysis is carried out twice at a high temperature to obtain the non-noble metal nitrogen-doped hollow carbon nanotube catalyst. An electrocatalyst material obtained by the preparation method has a huge application prospect in the aspects of fuel cells and electrolytic tanks.

Description

technical field [0001] The invention relates to a preparation method of a non-noble metal nitrogen-doped hollow carbon nanotube electrocatalyst. Background technique [0002] With the increasingly prominent energy and environmental issues, hydrogen-oxygen fuel cells have attracted the attention of experts and scholars due to their high energy conversion efficiency and environmental friendliness. The ideal catalyst for the battery cathode reaction oxygen reduction reaction (ORR) is a platinum-carbon catalyst, but The high price and limited reserves of platinum greatly limit the commercialization of fuel cells. Due to higher activity and lower cost, non-noble metal catalysts based on nitrogen-doped carbon nanotubes have become a research hotspot (J. Meng, D. Zhao and L. Mai, Journal of the American Chemical Society, 2017, 139, 8212-8221). At present, the preparation method of nitrogen-doped carbon nanotube oxygen reduction electrocatalyst is mainly to physically mix the nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/96B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 邵志刚杨丽梦姚德伟衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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