Preparation method for NxC-coated metal nanoparticle core-shell-structured material

A metal nanoparticle, core-shell structure technology, applied in metal material coating process, metal processing equipment, catalyst activation/preparation, etc., can solve the problems of poor product selectivity, unsatisfactory, low catalyst activity, etc., and achieve good selectivity Effect

Active Publication Date: 2019-10-22
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation and synthesis technology of nanomaterials is the main research direction at present. Some progress has been made in the synthesis and application of samples, but it still cannot meet the needs of the rapid development of society. Therefore, the preparation of nanomaterials plays a vital role in its application. important role
CO in the field of new energy in the existing technology 2 Catalytic reduction reaction catalyst activity is not high, C 2 Poor product selectivity greatly limits the development of new energy

Method used

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  • Preparation method for NxC-coated metal nanoparticle core-shell-structured material
  • Preparation method for NxC-coated metal nanoparticle core-shell-structured material
  • Preparation method for NxC-coated metal nanoparticle core-shell-structured material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 100mg of commercial nano-Cu powder into a 150mL round bottom flask, add 100mL 0.1M H 2 SO 4 Aqueous solution, stirred for 10 minutes to remove surface oxides. Wash with deionized water several times and centrifuge. After freeze-drying, weigh 50 mg and add it to 100 mL of acetonitrile solvent, ultrasonically disperse for 10 minutes, add 10 mg of 7,7,8,8-tetracyanoquinodimethane (TCNQ) under stirring conditions, continue stirring for 30 minutes, filter After washing with acetonitrile and freeze-drying for 12 hours, CuTCNQ-coated Cu nanoparticle precursors were obtained.

[0032] The above precursor was heated to 350 °C at a heating rate of 5 °C / min in a tube furnace under the condition of argon and hydrogen mixed gas, kept for 2 hours and then naturally cooled to room temperature. get N x C-wrapped Cu nanoparticles core-shell structure material (Cu@N x C).

[0033] N obtained from this example x C-wrapped Cu nanoparticle core-shell structure material for elec...

Embodiment 2

[0035] Weigh 100mg of commercial nano-Cu powder into a 150mL round bottom flask, add 100mL 0.1M H 2 SO 4 Aqueous solution, stirred for 10 minutes to remove surface oxides. Wash with deionized water several times and centrifuge. After freeze-drying, weigh 50 mg and add it to 100 mL of acetonitrile solvent, ultrasonically disperse for 10 minutes, add 2.5 mg of 7,7,8,8-tetracyanoquinodimethane (TCNQ) under stirring conditions, and continue stirring for 30 minutes, Filtration, washing with acetonitrile, and freeze-drying for 12 h gave CuTCNQ-coated Cu nanoparticle precursors.

[0036] The above precursor was heated to 350 °C at a heating rate of 5 °C / min in a tube furnace under the condition of argon and hydrogen mixed gas, kept for 2 hours and then naturally cooled to room temperature. get N x C-wrapped Cu nanoparticles core-shell structure material (Cu@N x C).

Embodiment 3

[0038] Weigh 100mg of commercial nano-Cu powder into a 150mL round bottom flask, add 100mL 0.1M H 2 SO 4 Aqueous solution, stirred for 10 minutes to remove surface oxides. Wash with deionized water several times and centrifuge. After freeze-drying, weigh 50 mg and add it to 100 mL of acetonitrile solvent, ultrasonically disperse for 10 minutes, add 5 mg of 7,7,8,8-tetracyanoquinodimethane (TCNQ) under stirring conditions, continue stirring for 30 minutes, filter After washing with acetonitrile and freeze-drying for 12 hours, CuTCNQ-coated Cu nanoparticle precursors were obtained.

[0039] The above precursor was heated to 350 °C at a heating rate of 5 °C / min in a tube furnace under the condition of argon and hydrogen mixed gas, kept for 2 hours and then naturally cooled to room temperature. get N x C-wrapped Cu nanoparticles core-shell structure material (Cu@N x C).

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Abstract

The invention discloses a preparation method for an NxC-coated metal nanoparticle core-shell-structured material. The preparation method comprises the following steps: 1) treating metal nanoparticleswith acid to remove oxides on the surface of the metal nanoparticles; 2) dispersing the obtained nanoparticles in a solvent (such as acetonitrile), slowly adding an organic ligand (such as TCNQ) witha certain mass under stirring, and reacting the ligand with the metal nanoparticles to form an organic salt with a certain thickness on the surfaces of the nanoparticles; and 3) roasting the organic salt-coated metal nanoparticles in a roasting atmosphere to obtain the NxC-coated metal nanoparticle core-shell-structured material. The invention further provides the application of the material. Theinvention provides the preparation method and the application of the NxC-coated metal nanoparticle core-shell-structured material with the metal nanoparticles as a precursor; and the material can be used as a catalyst for a CO2 reduction reaction and has good electrocatalytic activity, good selectivity, high reproducibility and good stability.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a core-shell structure material, in particular to a N x A preparation method of a C-wrapped metal nanoparticle core-shell structure material. Background technique [0002] One of the main directions of scientific and technological development in the 21st century is the development and application of new materials. The study of new materials is a deeper advance in human understanding and application of material properties. With the development of science and technology, people have developed new materials on the basis of traditional materials and according to the research results of modern science and technology. Nanomaterials are the most dynamic and rich scientific branch in the field of new materials. The preparation and synthesis technology of nanomaterials is the main research direction at present. Some progress has been made in the synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/34B22F1/02B82Y30/00B82Y40/00C23C18/12
CPCB01J27/24B01J35/0033B01J35/008B01J37/343B01J37/082B82Y30/00B82Y40/00C23C18/1204B22F1/16
Inventor 庄林李振
Owner WUHAN UNIV
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