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Nanoporous gold electrochemical preparation method

A nanoporous gold and electrochemical technology, applied in the field of electrochemical preparation of nanoporous gold, can solve problems such as poor working conditions, polluted environment, complicated process, etc., and achieve the effect of reducing costs

Inactive Publication Date: 2009-12-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above preparation process or method, the Ag-Au alloy system is used to prepare nanoporous gold, and the noble metal Ag is removed by corrosion, and the cost is relatively high; while Zn-Au surface alloying / dealloying treatment prepares porous gold, and the process is more complicated , and the composition of Zn-Au alloy is difficult to accurately control; more corrosive, non-environmentally friendly acidic or alkaline solutions are used, polluting the environment, toxic and irritating, and poor working conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) According to the ratio of 33.4 atomic percent Au and the rest being Al, the Al-Au alloy is put into a melting furnace and heated to a molten state, and then fully stirred to make it alloyed. Use argon to quickly blow out the molten liquid under a pressure of 0.1MPa, and chill it on a high-speed rotating copper roller with a cooling rate of 10 3 -10 6 K / s, obtain a thin alloy strip with a thickness of 20-40 microns, a width of 2-5 mm, and a length of 1-5 cm.

[0015] (2) At 25°C, with Al-Au alloy as the working electrode (anode), graphite as the cathode, 10wt.% sodium chloride solution as the electrolyte, and a working voltage of 1.5V, the electrochemical dealloying treatment was performed for 0.5 hours.

[0016] (3) Collect the reacted product, and rinse it repeatedly with distilled water until the electrolyte solution is completely washed (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The pore diameter an...

Embodiment 2

[0018] (1) According to the ratio of 20% Au by atomic percentage, and the rest is Al, the Al-Au alloy is put into a smelting furnace and heated to a molten state, and it is alloyed after sufficient stirring. Use argon to quickly blow out the molten liquid under a pressure of 0.1MPa, and chill it on a high-speed rotating copper roller with a cooling rate of 10 3 -10 5 K / s, obtain a thin alloy strip with a thickness of 30-50 microns, a width of 2-5 mm, and a length of 5-20 cm.

[0019] (2) At 70°C, Al-Au alloy was used as the working electrode (anode), graphite was used as the cathode, 10wt.% sodium chloride solution was used as the electrolyte, and the working voltage was 2.0V, and the electrochemical dealloying treatment was performed for 0.1 hour.

[0020] (3) Collect the reacted product, and rinse it repeatedly with distilled water until the electrolyte solution is completely washed (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and s...

Embodiment 3

[0022] The other steps were the same as in Example 1, except that the argon was replaced by nitrogen, and the 10wt.% sodium chloride solution was replaced by 10wt.% potassium chloride solution. The nanoporous gold pore structure is evenly distributed, and the pore diameter and pore wall size are about 10-20 nanometers.

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PUM

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Abstract

The invention relates to a nanoporous gold electrochemical preparation method, comprising the following steps: (1) heating the pure aluminum and gold to liquid state, stirring and mixing the mixture evenly, freezing the mixture in a certain cooling speed to form Al-Au precursor alloy; (2) placing the precursor alloy in neutral electrolyte solution to perform electrochemical dealloying process; and (3) washing the treated nanoporous gold in the distilled water until being neutral, airing to obtain the nanoporous gold. The beneficial effects of the invention are that the cost of the production of nanoporous gold is largely reduced; the adopted electrolyte solution is neutral sodium chloride or potassium chloride solution with non-toxic, non-polluting, non-irritating and environmental friendliness; the structure and size of the nanoporous gold can be adjusted and controlled according to the components of the precursor, working voltage and working temperature.

Description

technical field [0001] The invention relates to an electrochemical preparation method of nanoporous gold, belonging to the technical field of preparation methods of nanometer materials. Background technique [0002] Nanoporous metals are materials with nanometer-sized pores, the pore size of which is several nanometers to hundreds of nanometers, and the nanometer-sized pores and ligaments are three-dimensional bicontinuous and interpenetrating. Nanoporous metal is a special kind of porous material. The nanoscale pore size makes it have higher specific surface area and other unique physical, chemical and mechanical properties, such as high chemical catalytic activity, unique electrical conductivity, more High modulus of elasticity and strength etc. Therefore, nanoporous metals have great application potential in many fields. The current applied research mainly includes fuel cells, gas-phase and liquid-phase catalysis, excitation, sensing, surface-enhanced Raman scattering, a...

Claims

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Application Information

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IPC IPC(8): C25C5/02
Inventor 王艳张忠华张倩
Owner UNIV OF JINAN
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