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Method for manufacturing graphene-two-dimensional precious metal atomic layer composite materials

A technology of composite materials and noble metal ions, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of insufficient performance improvement of composite materials, and achieve Enhanced synergistic effect, convenient operation, and large particle size effect

Inactive Publication Date: 2014-01-22
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common chemical reduction method and the method of electrochemically reducing metal precursors in solution can only prepare composite materials of noble metal nanoparticles such as three-dimensional Pt.

Method used

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  • Method for manufacturing graphene-two-dimensional precious metal atomic layer composite materials
  • Method for manufacturing graphene-two-dimensional precious metal atomic layer composite materials

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Experimental program
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Effect test

Embodiment 1

[0022] The first step is the preparation of graphite oxide. Add 10g of natural graphite (50~80μm in particle size) to 230ml of concentrated sulfuric acid containing 5g of sodium nitrate (in an ice bath), then add 30g of KMnO 4 , and control the solution below 20°C, stir evenly, put it in a 35°C water bath for 30 minutes, then slowly add 460ml of distilled water to keep the reaction temperature at 98°C, and then react for 15 minutes, add 1.4L of distilled water and 10ml of hydrogen peroxide, The yellow suspension in the solution was centrifuged until the filtrate was washed with BaCl 2 No sulfate ion was detected, and the product was dried in air at 60°C for 12 hours, and stored in a desiccator.

[0023] In the second step, add 20mg of graphite oxide to 20ml of distilled water, ultrasonically disperse for 30min, take the dispersed graphite oxide solution and drop it on the glass carbon electrode, let it dry naturally and slowly.

[0024] In the third step, immerse the glass c...

Embodiment 2

[0028] The first, second, third, and fourth steps of this implementation are the same as in Embodiment 1.

[0029] The fifth step, after reduction, immerse the glass carbon electrode in 1mM K 2 PtCl 4 solution, reacted for 8 minutes, took out the electrode and washed it with distilled water. The catalytic activity of the composite for methanol oxidation reaction is ~10 times higher than that of commercial E-TEK Pt / C. (Catalytic activity test conditions: the reference electrode is Ag / AgCl, 3M Cl- electrode, the voltage scanning rate is 25mV / s, the solution is 0.5MCH 3 OH+0.1MHClO 4 , at a voltage of 0.58 V, the peak value of the graphene material of the present invention is 7.3 mA / μg, and the peak value of the commercial E-TEK Pt / C is 0.74 mA / μg).

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Abstract

The invention discloses a method for manufacturing graphene-two-dimensional precious metal atomic layer composite materials. The method comprises the following steps that ultrasonic dispersion is carried out on graphite oxide in aqueous solutions, graphene oxide solutions are formed and are dropped on the surface of a glass electrode, and the grapheme oxide solutions are dried gradually; the glass electrode is submerged in Pb2+solutions for a while, Pb2+ and graphene oxide generate an exchange reaction, and the Pb2+ is absorbed to the surface of the graphene oxide; electrochemical reduction is carried out on the glass electrode, the Pb2+ is reduced into Pb0, and meanwhile the graphene oxide is reduced into grapheme; then the glass electrode is submerged in the solutions of precious metal ions, the precious metal ions and the Pb0 generate a replacement reaction, and the graphene-two-dimensional precious metal atomic layer composite materials are obtained. The manufactured graphene-two-dimensional PtRu composite materials have ultrahigh catalytic activity on the oxidizing reaction of methanol, and the root lies in the strong coupling of the grapheme and two-dimensional precious metal atoms. The method is expected to enrich the manufacturing method of grapheme composite materials, to optimize the structure of the grapheme composite materials, to improve the performance of the grapheme composite materials and to widen the application range of the grapheme composite materials.

Description

technical field [0001] The invention relates to a preparation method for depositing two-dimensional noble metal atoms on the surface of graphene. The graphene-two-dimensional PtRu composite material prepared by the method has super high catalytic activity for methanol oxidation reaction. It belongs to the technical field of carbon materials. Background technique [0002] In recent years, the research of graphene-metal nanoparticle composites has received extensive attention in the field of materials and related disciplines, because such graphene composites have important potential applications in energy storage, fuel cell catalysts, sensors, etc. The noble metal Pt and its alloys have good catalytic activity for methanol oxidation and hydrogen ion oxygen reduction reaction, and are the materials with the highest catalytic activity found in direct methanol fuel cell anode and proton membrane fuel cell cathode catalysts. In order to better exert the catalytic activity of nobl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46
Inventor 胡忠良蒋海云张伟李娜黄志胡伟达
Owner HUNAN UNIV OF TECH
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