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A kind of transition metal-nitrogen doped carbon-based composite material and preparation method thereof

A carbon-based composite material, transition metal technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. Suitable for large-scale production and preparation, the preparation method is simple and fast, and the effect of large specific surface area

Active Publication Date: 2021-07-16
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that this preparation method is complicated and the reaction time is long, which is not conducive to large-scale production

Method used

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  • A kind of transition metal-nitrogen doped carbon-based composite material and preparation method thereof
  • A kind of transition metal-nitrogen doped carbon-based composite material and preparation method thereof
  • A kind of transition metal-nitrogen doped carbon-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The steps for preparing transition metal-nitrogen doped carbon-based composites are as follows:

[0037] 1) At room temperature, dissolve 0.5mmol ferrous chloride and 238mmol urea in deionized water, stir at a stirring speed of 600rpm for 2.5 hours to form a homogeneous solution, and place the homogeneous solution at 65°C for 12 hours to evaporate the water Afterwards, grind into powder;

[0038]2) Calcining the powder obtained above, the heating rate is 2.5°C / min, the calcination temperature is 550°C, and the calcination time is 3 hours. After the reaction is stopped, it is naturally cooled to room temperature and fully ground to obtain the transition metal element iron doped g-C 3 N 4 Precursor powder, its transmission electron microscope picture is as follows figure 1 shown;

[0039] 3) Doping g-C with transition metal element iron 3 N 4 The precursor powder was carbonized at high temperature, the heating rate was 2.3°C / min, the carbonization temperature was 650...

Embodiment 2

[0042] In this example, except that the nitrogen-containing organic small molecule in step 1 is dicyandiamine, the rest of the steps are the same as in example 1 to obtain a sheet-like transition metal iron and nitrogen-doped carbon-based composite material.

Embodiment 3

[0044] In the present embodiment, except that the ferrous chloride added in step 1 is 1 mmol and the concentration of dilute hydrochloric acid in step 4 is 0.25mol / L, all the other steps are the same as in embodiment 1, and the transition metal iron, Nitrogen-doped carbon-based composite; its transmission electron microscope scanning image is shown in image 3 shown.

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Abstract

The invention discloses a transition metal-nitrogen co-doped carbon-based composite material and a preparation method thereof. Transition metal chloride salts and nitrogen-containing organic small molecules are used as transition metal sources and carbon and nitrogen sources, and transition metals are directly obtained by a one-step method. Coordinated macrocyclic mixtures, and then carbonized to obtain transition metal-nitrogen-doped carbon-based composites, the preparation method is simple and quick, suitable for large-scale production preparation; the structure of the synthesized transition metal-nitrogen-doped carbon composites Nanosheets are produced, and the transition metals on the nanosheets exist in two forms, one is transition metal nanoparticles and the other is transition metal nitride nanoparticles; the synthesized transition metal and nitrogen-doped carbon composites have nitrogen-doped Carbon, transition metals and nitrogen atoms are coordinated and active sites with more defects and have a larger specific surface area; it is conducive to the application of transition metals and nitrogen-doped carbon-based composites in the fields of catalysis and energy storage.

Description

technical field [0001] The invention belongs to the field of preparation of functional materials, and relates to a preparation method based on a high-temperature pyrolysis polymer precursor method, in particular to a transition metal-nitrogen-doped carbon-based composite material and a preparation method thereof. Background technique [0002] Due to the unfilled d-orbital of the valence layer, the properties of transition metals are significantly different from those of other elements based on the eighteen-electron rule. Transition metals have many excellent properties. As metal elements, transition metals have good electrical conductivity and thermal conductivity; electrons in d orbitals of transition metal elements participate in the formation of chemical bonds when chemical reactions occur, and can exhibit various oxidation states; Transition metal elements have empty d orbitals for bonding and a high charge / radius ratio, and can form stable coordination compounds with va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J35/02B01J35/00
CPCB01J27/24B01J35/00B01J35/30B01J35/61
Inventor 江瑞斌张延佩
Owner SHAANXI NORMAL UNIV
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