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
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[0013] Example 1
[0014] (1) Put the Al-Au alloy into a melting furnace and heat it to a molten state according to the proportion of 33.4% Au at atomic percentage and the rest of Al, and then fully stir to make it alloyed. Use argon to quickly blow out the molten liquid at a pressure of 0.1 MPa, and chill it on a high-speed rotating copper roller at a cooling rate of 10 3 -10 6 K / s, to obtain an alloy ribbon 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., using Al-Au alloy as working electrode (anode), graphite as cathode, 10wt.% sodium chloride solution as electrolyte, working voltage of 1.5V, electrochemical desalloying treatment for 0.5 hours.
[0016] (3) Collect the reacted products, and rinse them repeatedly with distilled water until the electrolyte solution is completely cleaned (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The pore size and pore wall size are ...
Example Embodiment
[0017] Example 2
[0018] (1) Put the Al-Au alloy into a melting furnace and heat it to a molten state according to the proportion of 20 atomic percent Au and the rest being Al, and then fully stir it to alloy. Use argon to quickly blow out the molten liquid at a pressure of 0.1 MPa, and chill it on a high-speed rotating copper roller at a cooling rate of 10 3 -10 5 K / s, to obtain an alloy ribbon 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, using Al-Au alloy as working electrode (anode), graphite as cathode, 10wt.% sodium chloride solution as electrolyte, working voltage of 2.0V, electrochemical desalloying treatment for 0.1 hour.
[0020] (3) Collect the reacted products, and rinse them repeatedly with distilled water until the electrolyte solution is completely cleaned (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The nanoporous gold has a dual-mode pore distributio...
Example Embodiment
[0021] Example 3
[0022] The other steps are the same as in the first embodiment, replacing the argon with nitrogen and the 10wt.% sodium chloride solution with 10wt.% potassium chloride solution. The nano-porous gold pore structure is uniformly distributed, and the pore diameter and the pore wall size are about 10-20 nanometers.
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