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

A nanoparticle, iron phosphide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor controllability, poor uniformity of micro-nano structure, affecting material properties, etc. Uniform size, uniform micro-nano structure, simple and efficient process

Active Publication Date: 2021-09-07
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some patent reports on heteroatom-doped carbon microspheres mentioned above, most of the current preparation methods have poor controllability, and the chemical structure and micro-nano structure uniformity of the prepared materials are poor, which affects the material properties.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, the preparation of the heteroatom-doped carbon microsphere-supported iron phosphide nanoparticle catalyst is realized through the following steps:

[0029] Step 1, weigh 0.5g of hexachlorocyclotriphosphazene and 1.1g of 4,4'-dihydroxydiphenyl sulfone into a single-necked flask containing 100mL of acetone, and make hexachlorocyclotriphosphazene Dissolve with 4,4'-dihydroxydiphenyl sulfone; add 2mL triethylamine to the solution, keep the reaction temperature at 40°C, and react for 8 hours to obtain a milky white dispersion; after the reaction, centrifuge, wash with water, and dry to obtain a white Polyphosphazene microspheres;

[0030] Step 2, weigh 0.2 g of ferrous sulfate and dissolve it in 1 mL of water. After fully dissolving, add the solution to 50 mL of the aqueous dispersion of polyphosphazene microspheres with a concentration of 10 mg / mL; stir for 12 hours to make the polyphosphazene microspheres fully Adsorb ferrous sulfate; after the reaction, ...

Embodiment 2

[0033] In this example, the preparation of the heteroatom-doped carbon microsphere-supported iron phosphide nanoparticle catalyst is realized through the following steps:

[0034] Step 1, weigh 0.5g of hexachlorocyclotriphosphazene and 0.5g of p-phenylenediamine and dissolve in 60mL of acetone, measure 2mL of triethylamine and add it to the above solution, after fully dissolving, transfer the solution to 100mL polytetrafluoroethylene In a vinyl fluoride-lined digestion tank, react at 150°C for 3 hours; after the reaction, centrifuge, wash with ethanol, and dry to obtain light yellow polyphosphazene microspheres;

[0035] Step 2, weigh 0.1 g of ferrous chloride tetrahydrate and dissolve it in 1 mL of water. After fully dissolving, add the solution to 50 mL of the aqueous dispersion of polyphosphazene microspheres with a concentration of 10 mg / mL; stir for 12 hours to make the polyphosphazene The microspheres fully adsorb ferrous chloride tetrahydrate; after the reaction, centri...

Embodiment 3

[0038] In this example, the preparation of the heteroatom-doped carbon microsphere-supported iron phosphide nanoparticle catalyst is realized through the following steps:

[0039] Step 1, weigh 0.5g of hexachlorocyclotriphosphazene and 0.5g of p-phenylenediamine and dissolve in 60mL of acetone, measure 2mL of triethylamine and add it to the above solution, after fully dissolving, transfer the solution to 100mL polytetrafluoroethylene In a vinyl fluoride-lined digestion tank, react at 150°C for 3 hours; after the reaction, centrifuge, wash with ethanol, and dry to obtain light yellow polyphosphazene microspheres;

[0040]Step 2, take 0.1 g of iron acetate and dissolve it in 1 mL of ethanol, and after fully dissolving, add the solution to 50 mL of the ethanol dispersion of polyphosphazene microspheres with a concentration of 10 mg / mL; stir for 6 hours to make the polyphosphazene microspheres Fully adsorb iron acetate; after the reaction, centrifuge, wash, and dry to obtain polyp...

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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 microspheres support iron phosphide nanoparticles. The nanocatalyst uses polyphosphazene microspheres as heteroatom-doped porous carbon microsphere precursors, organic or inorganic iron salts as iron phosphide precursors, and is prepared by carbonizing polyphosphazene microspheres to absorb iron salts under an inert atmosphere. . The catalytic activity of the catalyst is close to that of commercial Pt / C catalysts, and it is cheap and easy to obtain. At the same time, its catalytic stability, resistance to methanol toxicity, and carbon monoxide toxicity are better than those of commercial Pt / C catalysts.

Description

Technical field: [0001] The invention belongs to the technical field of nano-material preparation, and relates to a nano-oxygen reduction catalyst, in particular to a nano-composite material based on heteroatom-doped carbon microspheres loaded with iron phosphide nanoparticles and a preparation process thereof. Background technique: [0002] Because electrochemical energy storage and conversion devices such as fuel cells and metal-air batteries are clean, safe, environmentally friendly, and efficient, they show broad application space and great potential in the fields of electric vehicles and mobile electronic products. However, as an important part of fuel cells and metal-air batteries, the kinetics of the oxygen reduction reaction at the cathode is very slow, requiring the use of catalysts to catalyze the process. Currently, the catalysts with the best performance are noble metal catalysts, such as Pt / C catalysts. However, due to the scarcity and high price of precious me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/88H01M4/9083Y02E60/50
Inventor 陈奎永刘悦刘涛梁士明王常春
Owner LINYI UNIVERSITY
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