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

A composite material, precious metal ion technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Enhance synergistic effect, large particle size, difficult to control effect

Inactive Publication Date: 2015-04-08
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
Comparison scheme
Effect test

Embodiment 1

[0021] 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.

[0022] 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.

[0023] In the third step, immerse the glass c...

Embodiment 2

[0027] The first, second, third, and fourth steps of this implementation are the same as in Embodiment 1.

[0028] 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 preparation method of a graphene-two-dimensional precious metal atomic layer composite material. The method consists of the following steps: ultrasonically disperse graphite oxide in an aqueous solution to form a graphene oxide solution, drop it on the surface of a glass electrode, and wait for it to dry slowly; immerse the glass electrode in a Pb2+ solution for a period of time, Pb2+ and graphite oxide ene exchange reaction, Pb2+ is adsorbed on the surface of graphene oxide; the glass electrode is electrochemically reduced, Pb2+ is reduced to Pb0, and graphene oxide is reduced to graphene at the same time; then the glass electrode is immersed in the solution of noble metal ions to make the noble metal ions A displacement reaction occurs with Pb0 to obtain a graphene-two-dimensional noble metal atomic layer composite material. The graphene-two-dimensional PtRu composite material prepared by the present invention has ultra-high catalytic activity for methanol oxidation, which is rooted in the strong coupling between graphene and two-dimensional noble metal atoms. The invention is expected to enrich the preparation method of the graphene composite material, optimize its structure, improve its performance and expand its application range.

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 Patents(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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