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In-situ anchoring co-reduction preparation method of carbon-based supported metal sub-nanoparticles

A load-bearing, sub-nanometer technology, applied in the field of materials science and engineering, can solve the problems of high preparation cost, low performance stability, difficult to achieve large-scale utilization, etc., to achieve the effect of optimizing performance

Inactive Publication Date: 2020-04-10
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ anchored co-reduction preparation method of carbon-based supported metal sub-nanoparticles to solve the problems of high preparation cost and stable performance in the existing carbon-based supported metal sub-nanoparticles preparation method The problem of low reliability and difficulty in achieving large-scale utilization

Method used

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  • In-situ anchoring co-reduction preparation method of carbon-based supported metal sub-nanoparticles
  • In-situ anchoring co-reduction preparation method of carbon-based supported metal sub-nanoparticles
  • In-situ anchoring co-reduction preparation method of carbon-based supported metal sub-nanoparticles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Carbon-based supported Pt metal subnanoparticles

[0021] raw material:

[0022] Biochar material (seaweed) is a commercially available raw material

[0023] Chloroplatinic acid hexahydrate is the raw material of Aladdin's official website

[0024] Cut the seaweed into filaments of 2 cm, and soak it in 0.08mol / L chloroplatinic acid dipping solution for 6 hours.

[0025] After impregnation, the sample was freeze-dried at a freezing temperature of -60°C and a vacuum of 1 Pa, freezing for 1 day and drying for 2 days to obtain a biochar precursor capable of maintaining the cell structure of the biochar material.

[0026] The biochar precursor was carbonized at a carbonization temperature of 600°C, the heating rate was 2°C / min, the holding time was 2 hours, and the protective atmosphere was Ar gas, thereby obtaining carbon-based supported Pt metal sub-nanoparticles.

Embodiment 2

[0028] Carbon-based supported Pt metal subnanoparticles

[0029] raw material:

[0030] Biochar material (potatoes) is a commercially available raw material

[0031] Chloroplatinic acid hexahydrate is the raw material of Aladdin's official website

[0032] Cut the potatoes into slices of 1*1*2cm, and soak them in 0.08mol / L chloroplatinic acid soaking solution for 6 hours.

[0033] After impregnation, the sample was freeze-dried at a freezing temperature of -60°C and a vacuum of 1 Pa, freezing for 1 day and drying for 2 days to obtain a biochar precursor capable of maintaining the cell structure of the biochar material.

[0034] The biochar precursor was carbonized at a carbonization temperature of 600°C, the heating rate was 2°C / min, the holding time was 2 hours, and the protective atmosphere was Ar gas, thereby obtaining carbon-based supported Pt metal sub-nanoparticles.

Embodiment 3

[0036] Carbon-based supported Pd metal subnanoparticles

[0037] raw material:

[0038] Biochar material (white radish) is a commercially available raw material

[0039] Palladium chloride is the raw material of Aladdin's official website

[0040] Cut the white radish into slices of 1*1*2cm, and soak it in 0.08mol / L palladium chloride soaking solution for 6 hours.

[0041] After impregnation, the sample was freeze-dried at a freezing temperature of -60°C and a vacuum of 1 Pa, freezing for 1 day and drying for 2 days to obtain a biochar precursor capable of maintaining the cell structure of the biochar material.

[0042] The biochar precursor was carbonized at a carbonization temperature of 600°C, the heating rate was 2°C / min, the holding time was 2 hours, and the protective atmosphere was Ar gas, thereby obtaining carbon-based Pd metal sub-nanoparticles.

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Abstract

The invention relates to an in-situ anchoring co-reduction preparation method of carbon-based supported metal sub-nanoparticles, and belongs to the technical field of material science and engineering.The metal nanoparticles prepared through the method comprise Pt, Pd, Rh, Ru, Ir, Au, Ag, Co, Ni and Cu; the size of the metal nanoparticles is controllable within the range of 1 nm to 10 nm, the loading capacity of the metal nanoparticles is adjustable within the range of 1 wt% to 25 wt%, and a carrier is an N and P doped carbon material. The preparation method comprises the following steps: 1) preparing a precursor solution with a certain concentration, and dipping a plant material in the solution for a period of time; 2) after fully dipping, taking out and freeze-drying to obtain a plant material anchored with precursor metal ion groups; 3) placing the material in a tubular furnace to carry out an in-situ carbonization co-reduction reaction to finally obtain the metal sub-nanoparticlesloaded on the carbon material. The preparation method has the advantages of simplicity, high efficiency, large amount, high density, wide application range and the like, and has remarkable advantagescompared with high-temperature pyrolysis, wet chemical methods, co-precipitation methods and the like.

Description

technical field [0001] The invention relates to an in-situ anchoring co-reduction preparation method of carbon-based supported metal subnano particles, which belongs to the technical field of material science and engineering. Background technique [0002] When the metal material is reduced from the macroscopic to the nanoscale, due to the special small size effect, surface effect, quantum size effect, quantum tunneling, dielectric confinement effect and other properties of the nanomaterial, it has special photoelectrochemical energy. and other fields exhibit better physical and chemical properties than their corresponding bulk materials. Therefore, metal subnanomaterials with smaller scales have been extensively researched and promoted recently. However, in the preparation process of metal subnanoparticles, when the size of the metal is reduced to the nanometer and subnanometer levels, its specific surface area increases sharply, and the free energy of the metal surface inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00B82Y30/00
CPCB22F9/22B82Y30/00B22F1/054
Inventor 闵鑫赵雅静房明浩陈爽闵祎鋆吴小文刘艳改黄朝晖
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)