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Preparation and application of metal monatomic two-dimensional material with graphene as substrate

A two-dimensional material, graphene technology, applied in metal processing equipment, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of complex preparation process, low single atomic rate, poor stability, etc., and achieve the goal of preparation The method is simple, the rate of single atoms is increased, and the effect of bonding is reduced

Active Publication Date: 2017-03-08
HEBEI UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a metal single-atom two-dimensional material with graphene as a substrate, so as to solve the problems of complex preparation process of the existing method, low single-atom rate, poor stability and low activity of the obtained product

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  • Preparation and application of metal monatomic two-dimensional material with graphene as substrate
  • Preparation and application of metal monatomic two-dimensional material with graphene as substrate
  • Preparation and application of metal monatomic two-dimensional material with graphene as substrate

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preparation example Construction

[0033] The preparation method of the metal single-atom two-dimensional material with graphene as the substrate of the present invention comprises the following steps:

[0034] The water-soluble salt of the target metal A and the water-soluble salt of the dispersed metal B are respectively dissolved in deionized water to form a solution, and then these two solutions are added to the dispersed graphene oxide aqueous solution in turn, and stirred at room temperature to make the oxidized Graphene adsorbs metal ions, centrifuges after 0.5 to 1 hour, removes the supernatant, and washes with deionized water for 1 to 3 times to obtain graphene oxide adsorbed with two metal ions; among them, metal A is Pt and Pd , Au, Ir, Ag, Rh, Os, Fe, Co, Ni, Cr, Mn, Ti, Sc, Zn, Ga, Y, Zr, Nb, Mo, Tc, Ru, Cd, In, Sn, Hf, Ta , any one of W, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Tl, Pb or Cu, metal B is Li , any one of Na, K, Rb, Cs, Ba or Sr;

[0035] Add an alkaline solut...

Embodiment 1

[0038] Example 1: Preparation of single-atom Ni two-dimensional material.

[0039] (1) Prepare 100mg / mL nickel nitrate solution and 100mg / mL sodium nitrate solution respectively with deionized water, take 6mL dispersed graphene oxide aqueous solution (concentration is 2mg / mL) and place it in a 500mL beaker, then use Add 1mL of sodium nitrate solution and 1mL of nickel nitrate solution into the above beaker with a pipette, and stir at room temperature to make the graphene oxide adsorb metal ions. After 30min of adsorption, centrifuge the above mixed solution with a centrifuge to remove the supernatant. The solid was washed twice with deionized water to obtain graphene oxide adsorbed with nickel ions and sodium ions;

[0040] (2) Add 2 mL of ammonia water (5.56 mol / L) to the above-mentioned graphene oxide adsorbed with nickel ions and sodium ions, after fully shaking, the measured pH value is about 10, let it stand for 5 minutes, add water to 8 mL and centrifuge, remove the supe...

Embodiment 2

[0044] Example 2: The preparation method of single-atom Ag two-dimensional material.

[0045] (1) Prepare 100mg / mL silver nitrate solution and 100mg / mL sodium nitrate solution with deionized water respectively, take 6mL dispersed graphene oxide aqueous solution (concentration is 2mg / mL) and place it in a 500mL beaker, and then use Add 1mL sodium nitrate solution and 1mL silver nitrate solution into the above beaker with a pipette, stir at room temperature to make graphene oxide adsorb metal ions, after 30min of adsorption, centrifuge the above mixed solution with a centrifuge to remove the supernatant, The solid was washed twice with deionized water to obtain graphene oxide adsorbed with silver ions and sodium ions;

[0046] (2) Add 2 mL of ammonia water (5.56 mol / L) to the above-mentioned graphene oxide adsorbed with silver ions and sodium ions. After fully shaking, the measured pH value is about 10, let it stand for 5 minutes, add water to 8 mL and centrifuge, and remove the...

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Abstract

The invention provides preparation and the application of a metal monatomic two-dimensional material with graphene as a substrate. The preparation method comprises the following steps that firstly, target metal ions and scattered metal ions are adsorbed to graphene oxide; then the scattered metal ions are removed through mineralization and washing; wrapping, heating reduction and annealing are conducted; and finally the target metal monatomic two-dimensional material with the graphene as the substrate is prepared. By adoption of the preparation method, the problem that metal single atoms are agglomerated and coupled to form clusters in the preparation process is effectively solved, and the monatomic rate of finished products is increased; the bonding effect between the metal single atoms and the graphene is effectively reduced, and the activity of the metal single atoms is reinforced; and the stability of the metal single atoms is improved, the problem that the metal single atoms are prone to being separated from the substrate is solved, and the real metal monatomic two-dimensional material is obtained.

Description

technical field [0001] The invention relates to the preparation and application of a single-atom material, in particular to the preparation and application of a metal single-atom two-dimensional material with graphene as a substrate. Background technique [0002] When the scale of the material is reduced to the single-atom scale, compared with ordinary nanomaterials, it has extremely high activity, unique physical and chemical properties, and many potential applications in technology. Such materials are called single-atom materials. Due to the above-mentioned unique properties, single-atom materials have attracted the attention of scientists all over the world, and are a research hotspot in the field of materials science today. In 2011, Zhang Tao's research group was the first to successfully prepare single-atom Pt / FeOx catalysts, which showed high catalytic activity and stability in CO oxidation and CO selective oxidation reactions, and thus proposed the concept of single-a...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0553B22F1/054B22F1/17
Inventor 李亚光吴志伟王凯
Owner HEBEI UNIVERSITY
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