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Nano porous gold-loaded ultrathin platinum metallic film catalyst and preparation method thereof

A nanoporous gold and platinum-series metal technology is applied in the field of nanoporous gold-supported ultra-thin platinum-series metal film catalysts and their preparation, and the effect of reducing the load is achieved.

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

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Problems solved by technology

[0007] After searching, there is no report on the preparation of ultra-thin platinum-group metal (alloy) films on porous gold using underpotential deposited metals as sacrificial templates.

Method used

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  • Nano porous gold-loaded ultrathin platinum metallic film catalyst and preparation method thereof
  • Nano porous gold-loaded ultrathin platinum metallic film catalyst and preparation method thereof
  • Nano porous gold-loaded ultrathin platinum metallic film catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) A gold-silver alloy foil with a thickness of 25 microns, a width of 1 cm, a length of 2 cm, and a gold atomic percentage of 26 at.% is placed in nitric acid with a concentration of 65-68 wt.%, and the corrosion time is 60 minutes. Then use deionized water to clean the nitric acid remaining in the pores to obtain nanoporous gold;

[0038] (2) At 25°C, a three-electrode electrochemical system was adopted, the nanoporous gold prepared above was used as the working electrode, the platinum sheet was used as the counter electrode, and the mercury-mercurous sulfate electrode was used as the reference electrode. 2 SO 4 +0.5mM CuSO 4 , deposited at -0.45V potential for 2 minutes, then transferred to 1mM PdCl 2 Replacement in the medium for 10 minutes to obtain a composite metal catalyst with a monoatomic layer of palladium film covering the porous gold surface.

Embodiment 2

[0040] (1) A gold-silver alloy foil with a thickness of 0.1 micron, a width of 2 cm, a length of 2 cm, and a gold atomic percentage of 26 at.% is placed in nitric acid with a concentration of 65-68 wt.%, and the corrosion time is 90 minutes. Then use deionized water to clean the nitric acid remaining in the pores to obtain nanoporous gold;

[0041] (2) At 25°C, a three-electrode electrochemical system was adopted, with the nanoporous gold prepared above as the working electrode, the platinum sheet as the counter electrode, and the mercurous sulfate electrode as the reference electrode, 0.5M H 2 SO 4 +0.5mM CuSO 4 , deposited at -0.45V potential for 5 minutes, then transferred to 1mM K 2 PtCl 6 Replacement in 10 minutes. Afterwards, it was washed with deionized water to obtain a composite metal catalyst in which half of the atomic layer of platinum covered the surface of the porous gold.

Embodiment 3

[0043] (1) A gold-silver alloy foil with a thickness of 0.1 micron, a width of 1 cm, a length of 1 cm, and a composition of 26 at.% gold atomic percentage is placed in nitric acid with a concentration of 65-68 wt.%, and the corrosion time is 60 minutes. Then use deionized water to clean the nitric acid remaining in the pores to obtain nanoporous gold;

[0044] (2) At 25°C, using a three-electrode electrochemical system, with the nanoporous gold prepared above as the working electrode, the platinum sheet as the counter electrode, and the mercurous sulfate electrode as the reference electrode, in 0.5M H 2 SO 4 +0.5mM CuSO 4 solution, deposited at a potential of -0.45V for 2 min, then transferred to 1 mM K 2 PtCl 4 Replacement in 10 minutes; then in the above-mentioned containing CuSO 4 In dilute sulfuric acid solution, deposit copper at -0.4V potential for 2 minutes, and in 1mM K 2 PtCl 4 The displacement was carried out in the medium for 10 minutes, and the composite nano...

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Abstract

The invention discloses a nanoporous gold supported ultrathin platinum metal film catalyst; the catalyst is an alloy sheet which is 0.1 - 100 micrometer thick, 0.1 - 10cm wide, and 0.1 - 20cm long, and is uniformly covered with a platinum metal atom layer on the surface thereof; the invention takes the method of under-potential depositing copper, silver or lead on the nanoporous gold and then performing exchange with the platinum metal cations to deposit the platinum metal film on the surface of the porous gold, thus obtaining the nanoporous gold supported ultrathin platinum metal film catalyst. The catalyst material prepared by the method of the invention can be easily controlled with regards to the aperture size, pore wall thickness and the platinum metal film thickness; and the catalyst is characterized by high specific surface area, high utilization ratio of the platinum metal, good catalytic activity and high anti-poisoning property.

Description

technical field [0001] The invention relates to a nanoporous composite metal catalyst with low noble metal loading which can be used for electrocatalytic oxidation of small organic molecules (methanol, formic acid, ethanol, etc.), electrocatalytic reduction of oxygen, oxidation of hydrogen, catalytic hydrogenation and the like. The preparation method particularly relates to a nanoporous gold-supported ultra-thin platinum group metal (alloy) film catalyst and a preparation method thereof. Background technique [0002] Fuel cell is a new type of clean energy, which can directly and efficiently convert the chemical energy of hydrogen, methanol, formic acid, ethanol and other fuels into electrical energy, and has the advantages of high fuel utilization rate, high energy density, clean and pollution-free. However, there are two bottlenecks in its widespread use, one is that the activity of the electrode catalyst is not high, and the other is that the cost of the catalyst is too h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/38B01J35/02C25D3/50B01J35/00
Inventor 丁轶刘朋朋
Owner SHANDONG UNIV
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