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Method for coating noble metal on nano porous gold and prepared catalyst

A nanoporous gold, nanoporous technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of large deposition of precious metals, and achieve high chemical resistance. Electrochemical corrosion, good electron transport properties, wide range of effects

Inactive Publication Date: 2008-12-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only suitable for very thin porous gold films that can float on the surface of aqueous solution, and the amount of precious metal deposition is relatively large
[0005] After searching, there is no report on the method of electrochemically modifying porous gold by surface ion adsorption and electrochemical reduction to prepare ultra-low noble metal loading catalysts.

Method used

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  • Method for coating noble metal on nano porous gold and prepared catalyst
  • Method for coating noble metal on nano porous gold and prepared catalyst
  • Method for coating noble metal on nano porous gold and prepared catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A commercial gold-silver alloy foil with a length of 2cm, a width of 1.8cm, and a thickness of 100nm was transferred to 68wt.% concentrated nitric acid and corroded for 30 minutes at room temperature (28°C) to prepare a nanoporous gold film. The SEM photo is as follows: figure 1 shown.

[0037] The prepared nanoporous gold film was immobilized on a glassy carbon (GC) electrode at 0.5 mmol dm -3 Soak in the chloroplatinic acid solution for 30 seconds, and some chloroplatinic acid ions are adsorbed on the nanoporous gold surface.

[0038] The nanoporous gold electrode adsorbed with chloroplatinate ions was washed three times with deionized water, each time for 5 minutes, and then under the three-electrode system, using reversible hydrogen as a reference, the chlorine adsorbed on the nanoporous gold surface was reduced by potential linear scanning Platinate ion. The reduction charge of chloroplatinate ion is as figure 2 As shown, the amount of modified platinum can be ...

Embodiment 2

[0041] A commercial gold-silver alloy with a length of 2 cm, a width of 1 cm, and a thickness of 25 μm was transferred to 68 wt.% concentrated nitric acid and corroded for 1 h at room temperature (28° C.) to prepare thick nanoporous gold.

[0042] Prepared nanoporous gold in 1mmol dm -3 Soak in the chloroplatinous acid solution for 10 minutes, and adsorb some chloroplatinous acid ions on the porous gold surface.

[0043] The nanoporous gold electrode adsorbed with chloroplatinous acid ion was washed three times with deionized water, 30 min each time, and then under the three-electrode system, with reversible hydrogen as a reference, the electrode adsorbed on the nanoporous gold surface was reduced by potential linear scanning. Platinum-modified nanoporous gold composite catalysts prepared from chloroplatinite ions.

Embodiment 3

[0045] (1) A gold-silver alloy with a thickness of 20 μm, a width of 3 cm, a length of 10 cm, and a gold mass ratio of 37% is placed in nitric acid with a concentration of 65 wt.%, at a temperature of 30° C., corroded for 20 min, and then deionized Wash the surface of the alloy and the nitric acid in the pores to obtain nanoporous gold;

[0046] (2) Fix the nanoporous gold on the glassy carbon electrode and place it at a concentration of 1mol dm -3 In the chloropalladium acid solution, soak 10min, allow the nanoporous metal surface to absorb chloropalladium acid ion;

[0047] (3) Place the nanoporous gold with chloropalladate ions adsorbed on the surface in a metal ion-free solution or deionized water, soak and wash for 10 minutes, replace with a new metal ion-free solution or deionized water, soak for another 15 minutes, repeat 5 times , until the nanoporous gold surface is cleaned;

[0048] (4) Place the nanoporous metal with clean surface adsorption of chloropalladate ion...

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Abstract

The invention discloses a method for finishing a noble metal coating of a porous gold and the method comprises the following steps: the nanoporous gold is made by corroding gold-silver alloy; the nanoporous gold is soaked into a certain concentration of a solution containing chloroplatinic acid radical ions (or chloroplatinous acid radical ions, or chloropalladic acid radical ions, or chloropalladic acid radical ions, or the mixture) for an appropriate time to cause the surface of the nanoporous gold to absorb some noble metal ions, the other noble metal ions except for the noble metal ions absorbed on the surface of the nanoporous gold are washed clean, and the noble metal ions absorbed are reduced to a noble metal simple substance under proper electrochemical conditions, and the noble metal simple substance is tightly bonded on the pore wall of the nanoporous gold. The method of the invention can be used for preparing a catalyst which combines porous metals with ultra-low content of noble metals and can be applied in the catalytic fields of fuel cells and the like.

Description

technical field [0001] The present invention relates to a nanoporous metal composite catalyst with ultra-low noble metal loading, which can be used in reactions such as methanol oxidation, hydrogen oxidation, oxygen reduction, and CO selective oxidation, and its preparation method, especially relates to a catalyst that utilizes A nanoporous metal combination catalyst with ultra-low noble metal loading prepared by modifying nanoporous gold with noble metal coating. technical background [0002] Due to its high energy conversion efficiency and low pollution, fuel cells have attracted more and more attention from governments, enterprises and scientific research institutions. Among them, the proton exchange membrane fuel cell is very suitable as a power source for automobiles and other mobile facilities due to its special advantages such as low-temperature quick start and compact structure. At present, the main reason hindering the commercialization of fuel cells is their high ...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J23/38C25D3/50H01M4/90
CPCY02E60/50
Inventor 丁轶王荣跃
Owner SHANDONG UNIV
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