Iron-nitrogen double-doped hollow porous carbon sphere nano material and preparation method thereof

A nano-material and double-doping technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of uneven dispersion, inability to increase specific surface area, and poor morphology of nitrogen-doped composite materials. Control and other issues, to achieve the effect of increasing the specific surface area, excellent electrocatalytic performance, and low price

Active Publication Date: 2019-08-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Benefits of technology

In this new type of magnetic particle made from silicon nitride shell layers on top of another layer containing metals like nickel or platinum, it was found that these particles were able to reduce harmful gases such as hydroxides during combustion processes without losing their effectiveness due to poor durability caused by acidic environments. These particles could be useful for various applications including fuel cells, batteries, sensors, etc., where they have potential benefits over existing technologies.

Problems solved by technology

This patented technical problem addressed in this patents relates to how to efficiently produce highly electrically conductive and stable carbons that contain both metal atoms and ammonia molecules at once without requiring complex processes or difficultly getting these components together.

Method used

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  • Iron-nitrogen double-doped hollow porous carbon sphere nano material and preparation method thereof
  • Iron-nitrogen double-doped hollow porous carbon sphere nano material and preparation method thereof
  • Iron-nitrogen double-doped hollow porous carbon sphere nano material and preparation method thereof

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preparation example Construction

[0029] The present invention firstly provides a method for preparing a hollow porous carbon sphere nanomaterial doped with iron and nitrogen, which specifically includes the following steps:

[0030] Step 1. Preparation of SiO 2 Core-shell precursor

[0031] Preparation of SiO 2 Nanosphere mixed solution, adding dopamine and F127 to the above mixed solution, stirring and reacting to obtain SiO 2 Core-shell structure precursor solution; the reaction temperature is preferably room temperature, and the reaction time is preferably 10-15 hours.

[0032] The source of the F127 is commercially available, specifically Pluronic F127.

[0033] SiO 2 The nanospheres can be prepared by the existing preparation method, for details, refer to [W.Stober, A.Fink, E.Bohn, E.J.Colloid Interface Sci. 1968, 26, 62-69].

[0034] For example, SiO 2 The preparation method of the nanosphere mixed solution is as follows: dissolving ammonia water and tetraethyl orthosilicate in the mixed solution ...

Embodiment 1

[0043] 1. Preparation of SiO 2 Core-shell precursor

[0044]1) Add 1.25ml of ammonia water and 1.40ml of ethyl orthosilicate to the mixed solution of ethanol and deionized water, stir evenly to obtain SiO-containing 2 Mixture of nanospheres;

[0045] 2) Add 0.30g dopamine and 0.15g F127 to the above solution, and stir at room temperature for 12 hours;

[0046] 2. Preparation of Fe / N double-doped hollow porous carbon nanomaterials

[0047] 1) Weigh 0.010g of iron acetylacetonate and dissolve it in ethanol, add it to the above solution, and stir at room temperature for 12 hours;

[0048] 2) centrifuging the reacted solution, washing with ethanol several times, and drying to obtain a solid product;

[0049] 3) Put the above solid product into a quartz boat, program the temperature up to 800°C under the protection of nitrogen, and heat-treat for 2 hours to obtain the intermediate product;

[0050] 4) Put the intermediate product into a 5wt.% hydrofluoric acid solution and etc...

Embodiment 2

[0056] 1. Preparation of SiO 2 Core-shell precursor

[0057] 1) Add 1.40ml of ammonia water and 1.20ml of ethyl orthosilicate to the mixed solution of ethanol and deionized water, stir evenly to obtain SiO-containing 2 Mixture of nanospheres;

[0058] 2) Add 0.20 g of dopamine and 0.15 g of F127 to the above solution, and stir at room temperature for 15 hours;

[0059] 2. Preparation of Fe / N double-doped hollow porous carbon nanomaterials

[0060] 1) Weigh 0.015g of iron acetylacetonate and dissolve it in ethanol, add it to the above solution, and stir at room temperature for 15 hours;

[0061] 2) centrifuging the reacted solution, washing with ethanol several times, and drying to obtain a solid product;

[0062] 3) Put the above solid product into a quartz boat, program the temperature up to 800°C under the protection of nitrogen, and heat-treat for 2 hours to obtain the intermediate product;

[0063] 4) Put the intermediate product into a 5wt.% hydrofluoric acid solutio...

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Abstract

The invention discloses an iron-nitrogen double-doped hollow porous carbon sphere nano material and a preparation method thereof, and belongs to the field of preparation of nano composite materials. The invention utilizes a dual-template method where a SiO2 nanosphere is used as a hard template and Pluronic F127 is used as a soft template, and dopamine wraps the outer surface of the SiO2 nanosphere to prepare a SiO2 core-shell structural precursor, and then iron is introduced into the SiO2 core-shell structure in the form of iron acetylacetonate, and an obtained solid product is subjected to high-temperature calcination and hydrofluoric acid etching reaction to obtain the iron-nitrogen double-doped hollow porous carbon sphere nano material. The material disclosed by the invention has an excellent electrocatalytic property and can be widely applied to oxygen reduction.

Description

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Claims

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Application Information

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Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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