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

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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): B01J27/24B01J35/10B01J35/02
CPCB01J27/24B01J35/02B01J35/1004
Inventor 江瑞斌张延佩
Owner SHAANXI NORMAL UNIV
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