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A method for regulating the microstructure of nanoporous gold

A nanoporous gold and microstructure technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve unfavorable applications, complicated preparation process, preparation time and High cost and other issues, to achieve the effect of improving electrocatalytic performance and high electrocatalytic activity

Inactive Publication Date: 2020-04-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above method for preparing porous gold is complex in preparation process, and the preparation time and cost are high, which is not conducive to the application in actual production.

Method used

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  • A method for regulating the microstructure of nanoporous gold
  • A method for regulating the microstructure of nanoporous gold
  • A method for regulating the microstructure of nanoporous gold

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Embodiment 1

[0039] Raw materials: high-purity aluminum nuggets (99.99wt%), high-purity gold nuggets (99.99wt%).

[0040] A method for regulating the microstructure and electrocatalytic performance of nanoporous gold, comprising the following steps:

[0041] (1) After weighing high-purity aluminum and high-purity gold elements according to the atomic ratio of 2:1, they are melted in a high-frequency induction furnace cooled by circulating water in a copper mold, and cooled to room temperature. After the melting process is repeated twice, purple gold is obtained. Al 2 Au ingot. The ingot was thrown through a single-roll chilling device at a speed of 14.7m / s to obtain an aluminum-gold alloy strip, the strip width was 3mm, and the thickness was 0.03mm.

[0042] (2) Immerse the aluminum-gold alloy strip obtained in step 1) in a hydrochloric acid solution with a mass fraction of 5%. In order to ensure that the aluminum atoms in the strip are completely dissolved, the dealloying process lasts ...

Embodiment 2

[0048] Raw materials: high-purity aluminum nuggets (99.99wt%), high-purity gold nuggets (99.99wt%).

[0049] A method for regulating the microstructure and electrocatalytic performance of nanoporous gold, comprising the following steps:

[0050] (1) After weighing high-purity aluminum and high-purity gold elements according to the atomic ratio of 2:1, they are melted in a high-frequency induction furnace cooled by circulating water in a copper mold, and cooled to room temperature. After the melting process is repeated twice, purple gold is obtained. Al 2 Au ingot. The ingot was thrown through a single-roll chilling device at a speed of 14.7m / s to obtain an aluminum-gold alloy strip, the strip width was 3mm, and the thickness was 0.03mm.

[0051] (2) Immerse the aluminum-gold alloy strip obtained in step 1) in a hydrochloric acid solution with a mass fraction of 5%. In order to ensure that the aluminum atoms in the strip are completely dissolved, the dealloying process lasts ...

Embodiment 3

[0057] Raw materials: high-purity aluminum nuggets (99.99wt%), high-purity gold nuggets (99.99wt%).

[0058] A method for regulating the microstructure and electrocatalytic performance of nanoporous gold, comprising the following steps:

[0059] (1) After weighing high-purity aluminum and high-purity gold elements according to the atomic ratio of 2:1, they are melted in a high-frequency induction furnace cooled by circulating water in a copper mold, and cooled to room temperature. After the melting process is repeated twice, purple gold is obtained. Al 2 Au ingot. The ingot was thrown through a single-roll chilling device at a speed of 14.7m / s to obtain an aluminum-gold alloy strip, the strip width was 3mm, and the thickness was 0.03mm.

[0060] (2) Immerse the aluminum-gold alloy strip obtained in step 1) in a hydrochloric acid solution with a mass fraction of 5%. In order to ensure that the aluminum atoms in the strip are completely dissolved, the dealloying process lasts ...

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Abstract

The invention relates to a method for regulating the microstructure of nanoporous gold. The present invention is immersed in the Al in the acidic solution 2 The Au precursor alloy strips were dealloyed under different magnetic field strengths, and then cleaned to obtain nanoporous gold samples with different microscopic morphologies and different catalytic activities. The preparation method comprises the following steps: 1) Al 2 Preparation of Au precursor alloy: high-purity aluminum and high-purity gold are heated and smelted in a heating furnace according to the ratio of atomic percentage of 2:1, and cooled to room temperature to obtain Al 2 Au original alloy ingot; cut the ingot into small pieces, and get Al through a strip machine 2 Au alloy strip; 2) the Al obtained in step 1) 2 The Au alloy strip is immersed in the acidic solution to react the aluminum in the alloy. At the same time, a magnetic field is applied to the reaction process. After the bubbles in the solution completely disappear, the dealloying process ends; the dealloyed nanoporous gold strip is washed repeatedly, Dry and serve. The preparation method of the invention is simple and easy to operate, and is beneficial to industrial application.

Description

technical field [0001] The invention relates to the technical field of preparation of porous metals, in particular to a method for regulating the microstructure of nanoporous gold. Background technique [0002] The dealloying method to prepare nanoporous metal is to use the chemical potential difference between different components in the alloy to selectively corrode one or more active components in the alloy, and the inert components form a three-dimensional porous structure and form nanoporous metals. Metal. The nanoporous gold material prepared by the dealloying method has a unique self-assembly, self-supporting and three-dimensional continuous nanostructure. Using its high specific surface area and low density, it has great potential in catalysis, sensing, excitation and new electrochemical energy systems. Wide range of applications. [0003] The electrocatalytic performance of nanoporous gold is closely related to the size of its nanopores; in fact, many properties of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C3/00C22C1/08C22C5/02B01J23/52B01J35/04B01J37/34
CPCC22C1/08C22C3/00C22C5/02B01J23/52B01J35/04B01J37/342C22C1/081
Inventor 王伟民徐慧刘帅闫芝成殷培菊
Owner SHANDONG UNIV