Porous core-shell nano auriferous alloy and preparation method for same

A porous core and alloy technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of limited catalytic activity of single crystal core-shell metal nanostructures, achieve excellent catalytic performance, Strong reproducibility, simple and controllable effect

Inactive Publication Date: 2012-07-18
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem of limited catalytic activity of single crystal core-shell metal nanostructures, the present invention provides a porous Au-M (M=Au, Pd, Pt and alloys thereof) core-shell nanostructure catalyst and a preparation method thereof

Method used

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  • Porous core-shell nano auriferous alloy and preparation method for same
  • Porous core-shell nano auriferous alloy and preparation method for same
  • Porous core-shell nano auriferous alloy and preparation method for same

Examples

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Embodiment 1

[0026] Weigh 1.2 mg of AuAg core-shell nanoparticles, disperse in 10 mL of deionized water, add 1 mL of 10.2 mmol / L HAuCl 2 The solution was left to stand for 2 hours in the dark at room temperature. Centrifuge the product, collect the precipitate, and wash it sequentially with ammonia water, deionized water, and absolute ethanol to prepare a porous Au-Au core-shell nanostructure, such as figure 1 As shown, the shell consists of Au nanoparticles with a thickness of about 35 nm.

Embodiment 2

[0028] Weigh 2.4mg of AuAg core-shell nanoparticles, disperse in 15mL of deionized water, add 2mL of 13.5mmol / L H 2 PdCl 4 Aqueous solution, stand in the dark for 4 hours at room temperature. Centrifuge the product, collect the precipitate, and wash it sequentially with ammonia water, deionized water, and absolute ethanol to prepare a porous Au-Pd core-shell nanostructure, such as figure 2 As shown, the shell consists of Pd nanoparticles with a thickness of about 25 nm.

Embodiment 3

[0030] Weigh 1.5 mg of AuAg core-shell nanoparticles, disperse in 12 mL of deionized water, add 1.5 mL of K with a concentration of 18.5 mmol / L 2 PtCl 4 Aqueous solution, stand in the dark for 6 hours, the temperature is 60°C. Centrifuge the product, collect the precipitate, and wash it sequentially with ammonia water, deionized water, and absolute ethanol to prepare a porous Au-Pt core-shell nanostructure, such as image 3 As shown, the shell consists of Pt nanoparticles with a thickness of about 30 nm.

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Abstract

The invention discloses a porous core-shell nano auriferous alloy and a preparation method for the same. The alloy comprises an Au (gold) core and a metal shell of a porous structure, the thickness of the shell ranges from 25nm to 35nm, and components of the shell consist of Au, Pd (palladium), Pt (platinum) and alloy of Au, Pd and Pt. Compared with the prior art, the method is used for preparing a porous core-shell auriferous alloy nano structure by using low-valence (univalent or divalent) noble metal saline solution as raw materials. The method is simple, controllable, high in reproducibility and generally applicable, and purity approximates 100%. Compared with a monocrystal core-shell nano structure, the porous core-shell auriferous alloy nano structure is larger in specific surface area and more excellent in catalysis, and can be used for heterogeneous catalysis and used as electrode materials for electro-catalysis and fuel cells.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic nanometer materials and preparation methods thereof. technical background: [0002] For more than 20 years, functional nanomaterials have shown amazing application value and potential in energy catalysis, organic catalysis, photocatalysis and other important fields related to the lifeline of the national economy. In particular, noble metal nanostructures (such as Au, Pd, and Pt, etc.) have attracted widespread attention due to their excellent catalytic properties. A large number of research facts have shown that the catalytic performance of nanocatalytic materials has a significant structure dependence, so studying and constructing highly active nanostructures is one of the keys to solving catalytic problems. In recent years, core-shell nanostructures have received extensive attention, and have significantly enhanced catalytic activity and catalytic stability in the fields of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00
Inventor 耿保友蒯龙
Owner ANHUI NORMAL UNIV
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