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Graphene-like framework-loaded single-atom structure material and its preparation method and application

An atomic structure and graphene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as obstacles, limitations of active atom catalytic efficiency, etc.

Active Publication Date: 2021-07-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is simple and easy, and the single-atom material metal atoms have a good degree of dispersion and stability, but because the ions will be hindered from entering the carbon structure, the catalytic efficiency of the active atoms located inside will be limited.
At present, it is still a great challenge to prepare single-atom catalysts with superior catalytic performance and high stability through a simple, controllable and universal synthetic method.

Method used

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  • Graphene-like framework-loaded single-atom structure material and its preparation method and application
  • Graphene-like framework-loaded single-atom structure material and its preparation method and application
  • Graphene-like framework-loaded single-atom structure material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Weigh 19mmol of zinc acetate and 1mmol of cobalt nitrate and dissolve them in 200mL of ethanol in a water bath at 65°C to form a mixed solution;

[0039] 2) Weigh 40mmol of citric acid monohydrate and dissolve it in 50mL of ethanol, and slowly add it dropwise to the mixed solution of step 1) to produce flocculent gel;

[0040] 3) drying the gel prepared in step 2) at 80°C for 24 hours to obtain a xerogel;

[0041] 4) Dry the dry gel obtained in step 3) in the air at 5°C for min -1 The heating rate is increased to 600 ° C for 6 hours to form Co-doped ZnO nanoparticles;

[0042] 5) Weigh 2g of Co-doped ZnO nanoparticles prepared in step 4) and place them in a vacuum oven at the same time as 4g of 2-methylimidazole. Under a pressure of 100Pa, heat up to 140°C and keep for 6h to obtain a metal-organic framework coating. Co-doped ZnO nanoparticle structure;

[0043] 6) The metal-organic framework structure obtained in step 5) is coated with Co-doped ZnO nanoparticles i...

Embodiment 2

[0053] 1) Weigh 19mmol of zinc acetate and 1mmol of ferric nitrate and dissolve them in 200mL of ethanol in a water bath at 65°C to form a mixed solution;

[0054] 2) Weigh 40mmol of citric acid monohydrate and dissolve it in 50mL of ethanol, and slowly add it dropwise to the mixed solution of step 1) to produce flocculent gel;

[0055] 3) drying the gel prepared in step 2) at 80°C for 24 hours to obtain a xerogel;

[0056] 4) Dry the dry gel obtained in step 3) in the air at 5°C for min -1 The heating rate is increased to 600 ° C for 6 hours to form Fe-doped ZnO nanoparticles;

[0057] 5) Weigh 2g of the prepared Fe-doped ZnO nanoparticles and 4g of 2-methylimidazole in a vacuum oven at the same time as in step 4). Under the pressure of 100Pa, heat up to 140°C for 6h to obtain metal organic framework coating Fe-doped ZnO nanoparticle structure;

[0058] 6) The metal-organic framework structure obtained in step 5) coated Fe-doped ZnO nanoparticle structure in N 2 at 5°C mi...

Embodiment 3

[0063] 1) Weigh 19mmol of zinc acetate and 1mmol of nickel nitrate and dissolve in 200mL of ethanol in a water bath at 65°C to form a mixed solution;

[0064] 2) Weigh 40mmol of citric acid monohydrate and dissolve it in 50mL of ethanol, and slowly add it dropwise to the mixed solution of step 1) to produce flocculent gel;

[0065] 3) drying the gel prepared in step 2) at 80°C for 24 hours to obtain a xerogel;

[0066] 4) Dry the dry gel obtained in step 3) in the air at 5°C for min -1 The heating rate was increased to 470 ° C for 6 hours to form Ni-doped ZnO nanoparticles;

[0067] 5) Weigh 2g of the prepared Ni-doped ZnO nanoparticles and 4g of 2-methylimidazole in a vacuum oven at the same time as in step 4). Under the pressure of 100Pa, heat up to 140°C and keep it for 6h to obtain metal-organic framework coating Ni-doped ZnO nanoparticle structure;

[0068] 6) Coating the metal-organic framework structure obtained in step 5) with Ni-doped ZnO nanoparticles on N 2 at 5...

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Abstract

The invention relates to a controllable preparation method of a graphene-like frame-loaded single-atom structure material, which can be used as a material in energy storage and conversion devices. Graphene-like frame-loaded single-atom structure material, which is composed of single metal atoms uniformly loaded on the graphene-like frame, the graphene-like frame is a hollow film-like structure, and the specific surface area of ​​the material is 600-800m 2 g ‑1 . The beneficial effects of the present invention are: the present invention uses a doped ZnO template as a precursor, the template not only disperses the dopant atoms well, but also forms a doped MOF shell through low-pressure deposition of gaseous organic ligands, and the doped The MOF shell can in turn be used to form a single-atom structure material with stable and dispersed graphene-like framework loading. This type of graphene framework-loaded single-atom material has excellent oxygen reduction catalytic performance as an electrocatalytic material. This method has the potential for large-scale application.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemical devices, and in particular relates to a controllable preparation method of a graphene-like frame-loaded single-atom structure material. The material can be used as a material for energy storage and conversion devices, and has great universal application sex. Background technique [0002] Electrochemical energy storage and conversion devices are an important component of sustainable development. Electrocatalysts play an important role in these high-performance devices. Due to limitations in activity, selectivity, and stability, traditional electrocatalysts are far from meeting the requirements of sustainable development. The single-atom catalysts that have emerged in recent years reduce the size of metal nanoclusters to the size of single atoms, thereby improving atom utilization efficiency and electrocatalytic performance, including improving reaction selectivity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J35/10
CPCB01J23/80B01J35/617
Inventor 麦立强刘世宇孟甲申刘金帅
Owner WUHAN UNIV OF TECH
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