A heteroatom-doped carbon nanotube-supported oxygen reduction catalyst of iron phosphide nanoparticles and its preparation method

A technology of carbon nanotubes and nanoparticles, which is applied in the field of preparation of new nanomaterials, can solve the problems affecting the catalytic performance of oxygen reduction materials, increase the number of active sites, and poor conductivity of transition metal compounds, and achieve excellent catalytic performance of oxygen reduction and application Environmental friendliness and high production efficiency

Active Publication Date: 2021-08-31
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal compounds also have disadvantages as fuel cell catalysts: (1) transition metal compounds have poor conductivity and need to be loaded on a certain conductive carrier; (2) transition metal compounds need to be micronized to increase active sites quantity, thereby increasing the catalytic effect of the catalyst
The homogeneity of the micro-nano structure of the catalyst obtained by this method is poor, and the controllability of the chemical structure is poor, which affects the oxygen reduction catalytic performance of the material.

Method used

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  • A heteroatom-doped carbon nanotube-supported oxygen reduction catalyst of iron phosphide nanoparticles and its preparation method
  • A heteroatom-doped carbon nanotube-supported oxygen reduction catalyst of iron phosphide nanoparticles and its preparation method
  • A heteroatom-doped carbon nanotube-supported oxygen reduction catalyst of iron phosphide nanoparticles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This supported carbon nanotubes prepared in Example iron phosphide oxygen reduction catalyst nanoparticles heteroatoms doping is achieved by the following steps:

[0026] Step one, weighed 0.5g hexachloro cyclotriphosphazene and 1.1 g of 4,4'-dihydroxydiphenyl sulfone was added to a 100mL one-neck flask equipped with tetrahydrofuran, make hexachlorocyclohexane ultrasonic water bath at 50 deg.] C cyclotriphosphazene and 4,4'-dihydroxydiphenyl sulfone was dissolved; the solution again 2mL of triethylamine was slowly added dropwise, maintaining the reaction temperature was 50 ℃, 12h reaction; after completion of the reaction by centrifugation, washed with water, and dried to give a white polyphosphonate nitriles nanotubes;

[0027] Aqueous dispersion of polyphosphazene nanotubes step two, ferrous chloride tetrahydrate weighed 0.1g in 1mL of water was added to a concentration of 50mL fully dissolved after the solution was 10mg / mL in; 12h stirring so polyphosphazenes nanotubes...

Embodiment 2

[0030] This supported carbon nanotubes prepared in Example iron phosphide oxygen reduction catalyst nanoparticles heteroatoms doping is achieved by the following steps:

[0031] Step one, weighed 0.5g hexachloro cyclotriphosphazene was dissolved in 50mL of tetrahydrofuran was thoroughly dissolved, at 40 ℃ ultrasonic water bath, was added dropwise to the solution dissolving 1.1 g of 4,4'-dihydroxydiphenyl tetrahydrofuran and 2mL of pyridine sulfone; maintaining the reaction temperature was 40 ℃, reaction was 12h; after completion of the reaction by centrifugation, washed with water, and dried to give a white polyphosphazene nanotubes;

[0032] Aqueous dispersion of polyphosphazene nanotubes step two, ferrous chloride tetrahydrate weighed 0.1g in 1mL of water was added to a concentration of 50mL fully dissolved after the solution was 10mg / mL in; 12h stirring so polyphosphazenes nanotubes sufficiently adsorbed ferrous chloride tetrahydrate; after completion of the reaction by centr...

Embodiment 3

[0035] This supported carbon nanotubes prepared in Example iron phosphide oxygen reduction catalyst nanoparticles heteroatoms doping is achieved by the following steps:

[0036] Step one, weighed 0.5g hexachloro cyclotriphosphazene was dissolved in 50mL of tetrahydrofuran was thoroughly dissolved, at 40 ℃ ultrasonic water bath, was added dropwise to the solution dissolving 1.1 g of 4,4'-dihydroxydiphenyl tetrahydrofuran and 2mL of pyridine sulfone; maintaining the reaction temperature was 40 ℃, reaction was 12h; after completion of the reaction by centrifugation, washed with water, and dried to give a white polyphosphazene nanotubes;

[0037] Ethanol dispersion of polyphosphazene nanotubes step two, taking said iron acetate 0.1g in 1mL of ethanol, after fully dissolved this solution was added to 50mL concentration of 10mg / mL in; polyphosphazenes stirred 6h make nanotubes sufficiently adsorption iron acetate; after completion of the reaction by centrifugation, washed with water, ...

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Abstract

The invention belongs to the technical field of nano-material preparation, and relates to an oxygen reduction catalyst in which heteroatom-doped carbon nanotubes support iron phosphide nanoparticles. The nanometer catalyst uses polyphosphazene nanotubes as heteroatom-doped carbon nanotube precursors, and uses organic iron salts or inorganic iron salts as iron element precursors. After the polyphosphazene nanotubes absorb the precursor of iron element, and the next step is high-temperature carbonization in an inert atmosphere, a heteroatom-doped carbon nanotube-loaded iron phosphide nanoparticle composite material is obtained. The composite material has excellent oxygen reduction catalytic performance, and its catalytic activity of the oxygen reduction catalyst is close to that of the commercial Pt / C catalyst, and it is cheaper and easier to obtain. Catalyst is better.

Description

Technical field: [0001] The present invention belongs to the technical field of nano preparation of new materials, it relates to a nano oxygen reduction catalyst, in particular one heteroatom doped oxygen reduction catalyst supported carbon nanotubes and iron phosphide preparation of nanoparticles. Background technique: [0002] Fuel cells, metal-air batteries and other electrochemical devices having a new clean energy sources, and high efficiency. The current society, people's growing awareness of environmental protection, new energy vehicles at the same time, the rapid development of mobile electronic devices, new energy devices to fuel cells, metal-air batteries, etc. has brought unprecedented opportunities for development. However, an important part of the new electrochemical energy devices cathode, the oxygen reduction catalyst activity is insufficient, which limits the development of new energy devices. Noble metal catalyst having excellent catalytic activity, however, its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B82Y30/00H01M4/90
CPCB01J27/1853B82Y30/00H01M4/9083Y02E60/50
Inventor 刘悦陈奎永崔亮刘敬权
Owner LINYI UNIVERSITY
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